Ford & Dorman PI Intake Manifolds Explained | 1999-2004 4.6L 2V Mustang GT

Рет қаралды 33,488

Күн бұрын

In this video, Landan explains some important information regarding the Ford OEM and Dorman PI intake manifolds.
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Ford OEM PI Intake: lmr.parts/LRS-9424AB
Ford Performance PI Intake: lmr.parts/M9424P46
Dorman Intake: lmr.parts/LRS-9424C
99-04 Mustang Intakes & Parts: lmr.com/products/94-04-Mustan...
99-04 Mustang Ignition Parts: lmr.com/products/94-04-Mustan...
Alternator Bracket: lmr.parts/LRS-10153A
Thermostat Gasket: lmr.parts/LRS-8255A
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Keeping Comp Playlist: • Project Keeping Comp
Chapters
Intro - 0:00
TSB Information - 0:52
Dorman Intake Information - 1:35
Ford Intake Information - 2:38
Scenarios Explained - 3:10
Dyno Results - 4:29
Outro - 6:22
Use of this video is subject to the terms as set forth in our LMR Install Video Disclaimer | lmr.com/page/lmr-install-vide...

Пікірлер: 126

@ryanwilliams7232 18 күн бұрын

I just put on this ford performance intake yesterday. Big huge difference. Very happy with it

@TearItUpFixItTV 10 күн бұрын

Where’d you get it ordered from??

@gixxerbrah4100 5 күн бұрын

@@TearItUpFixItTV thats what im trying to figure out

@loganwest6406 2 ай бұрын

So, thanks to this video, I found out today that my mustang I drive everyday has a doorman, and the mustang I have sitting in the junkyard has a performance one on it. I was wondering why my Boltons made me feel like I was competing with my old one stock. Looks like I'm spending this weekend getting an extra 20 hp hopefully. Great video.

@T-MillProductions 9 ай бұрын

Very well put together video!

@latemodelrestoration 9 ай бұрын

Glad you liked it! -Landan

@sycodicstreetracer287 Жыл бұрын

Hey lmr love the video. But as someone from the new edge community I think a big hit you could do for 2vs is manufacturing a new intake to compete with Logan style intakes, Victor, typhoon etc definitely not many options out there

@Chris1982416 Жыл бұрын

Do it with the typhoon full aluminum intake manifold. I want to see what it can do. I got stuck getting a Dorman. I got it on rock auto for $65 with express shipping included. So I got a super steal but now I realize thanks to your video I'm being robbed of horsepower. I wish I had knew this 8 years ago 😪

@alexcaddel117 Жыл бұрын

Where was this video when I needed it 5 years ago, when I had a Dorman manifold crack at the coolant crossover 😂

@P71ScrewHead 8 ай бұрын

He was waiting for yours to crack..lol

@richardthompson6366 Жыл бұрын

Just put a Dorman on my 97 Thunderbird, thermostat that came with it failed immediately and engine got hot. I put the old thermostat in and so far so good.

@robsorgdrager8477 Жыл бұрын

The pi intake from Ford is cheaper and flows more. The dorman one actually flows less than a non pi intake and it is the same as installing a check engine light.

@hermanrogers1325 Жыл бұрын

I believe you are right because every since the mechanic installed the dorman door knob on my 04 mustang GT the check engine light stay on and he clear the code and it comes right back on but the car is still running good but I can feel a power lost on top end and down low

@sategllib2191 11 ай бұрын

Dorman is junk

@jawsh3893 Жыл бұрын

I run the Dorman intake, because the Ford one was out of stock :/ I did not appreciate the self tapping screws-but honestly everything else was very convenient. The Dorman intake is a KIT-cost about 200$ for the intake manifold, the gaskets, thermostat, o-ring, and hardware. After install, I did not notice a real difference in power-except for smoother engine operation. I’ve been running it on my car for a year, and it’s been good to me so far. I’m very surprised of how much the Dorman affected this car.

@neilbrown82 Жыл бұрын

Lol did u even look at the 2 it's definitely obvious

@juansabal9995 5 ай бұрын

The loose of power is obviously at top end

@luthermoore2969 Жыл бұрын

And like he says in the video, and it's key. Individual results may vary.

@GamesToolsAndCools Жыл бұрын

Make a video about the gains of the typhoon intake

@mattmccoy2410 Жыл бұрын

Found out a while back that the Dorman was complete trash. I had a leaking crossover pipe on my 05 town car. Went to the local salvage yard and grabbed a Dorman unit off of an old taxi. Once installed it had terrible throttle response. Definitely was not the same car. I ended up buying a replacement intake manifold from 1A auto. It actually was dang near identical the original ford part. I installed it and the throttle response was back and I save a couple hundred.

@jake6483 Ай бұрын

I have a 08 4.6l F150 That I just bought a dormant intake for. It was warped, So I have a mighty vaccuum leak. I think I might just try to return it and get the 1aauto part. I'm so sick of fighting this damn thing

@countryboy9546 17 күн бұрын

I imagine the 1a auto part is also a Dorman as nobody else is really making these. Every aftermarket intake is a rebranded Dorman part.

@mattmccoy2410 17 күн бұрын

@@countryboy9546 I can assure you it is not.

@mattmccoy2410 17 күн бұрын

@@countryboy9546 for some further clarification the Dorman unit has short runner design. The OEM has the longest runners but the 1A auto comes dang to the factory runner length.

@countryboy9546 17 күн бұрын

@@mattmccoy2410 yeah, I was looking at that. I see the short design in photos online of the Dorman intake. You must be talking about the TRQ intake which does seem to lend itself to having a longer runner design. I’m hearing Dorman has changed their intake design and has improved it their most current intake vs the old part.

@juansabal9995 Жыл бұрын

Good video, but never mentioned about the EXHAUST MANIFOLDS between pi and npi. So, do the pi exhaust manifolds flows more or equally than npi?

@latemodelrestoration Жыл бұрын

juan - We're splitting hairs when it comes to the manifold designs for 96-98 and 99-04 cars. Both are a log-style design with not enough differences to see a noticeable power increase/decrease. -Landan

@P71ScrewHead 8 ай бұрын

In other words, get longtubes or shorties but not logs..lol

@hermanrogers1325 Жыл бұрын

My 04 mustang GT intake manifold cracked and my mechanic told me he would put the best that money can buy because that’s what I wanted and I wanted to keep the car original with ford quality parts and he put a dorman intake on and said it was from ford now I got to do it right myself

@sategllib2191 11 ай бұрын

What a liar. I'm sorry

@P71ScrewHead 8 ай бұрын

Sue his ass for lying n having to replace it again.. He knew what he was doing when he sold you that crap..

@juansabal9995 5 ай бұрын

False

@adamaronovski8857 Жыл бұрын

Just put a dorman in cuz i couldnt find a ford one. I was searching for a fix for my lean condition code ended up being my fuel pump. But apples to apples, i felt my explorer with a 2v running a little better on the dorman. Also visibly from the exterior the runners look bigger but shorter than the Ford one.

@hermanrogers1325 3 ай бұрын

I replaced my doorman intake manifold with the ford PI intake and add a 70 mm throttle body and hello and good morning or night and day difference on my 04 mustang GT automatic

@santosaleman7060 4 ай бұрын

Can I take off the pre installed gaskets from the dorman intake and put ford original gaskets?

@latemodelrestoration 4 ай бұрын

No. -Landan

@TravisMcKnight-lk7gg 10 сағат бұрын

Ford racing PI OE intake manifold, plus long tupe headers 👍 on a P-71 interceptor 4.6 liter from 2 inch dual exhaust with H pipe to X pipe with 2 1/2 inch dual exhaust swap , which helps equalize exhaust pulses at higher RPMs (327) rear end gear ⚙️ ratio. I need them gains, then increase throttle body diameter and true cold air intake.

@dantheman316 Жыл бұрын

Ford part is worth every penny

@bradleymoney07 2 ай бұрын

That’s unfortunately now out of production from ford so now it’s the only option other than opr

@rickjames5576 Жыл бұрын

Am going from a Dorman to a PPI and don't know where to source EGR Bracket to intake bolts, Coil on plug bolts, or fuel rail bolts. Does anyone know?

@MrDino27 Жыл бұрын

AutoZone help rack

@punkbutler88 16 күн бұрын

wonder if it would help/work on my 95 tbird. I have the original aluminum intake. HMMM

@musclecargarage8882 Жыл бұрын

I did the kinda of a pain but not hard to replace

@patrickdubuc3439 Жыл бұрын

Would that Ford intake fit a 97 mustang GT?

@THEWATER3UCKET Жыл бұрын

If your 97 gt has pi heads than yeah

@patrickdubuc3439 Жыл бұрын

@@THEWATER3UCKET i see people putting the pi intake on non pi heads with success.with a few modifications done to it of course

@luthermoore2969 Жыл бұрын

I just put a TRQ stick replacement on my 97 MGM non pi engine but it seems like a good product. Been driving it for a out a week now with no problems no leaks. I think even though it's a stock replacement it could make a little less than the stock intake just due to car being stock everywhere else. I did clean and somewhat polish the plenum and throttle body. It does have a lag some I'm the lower range but in the higher rpms it seems just like the stock one as far as I can tell. The lag may be the air fuel ratio and I would have to get it tuned for that

@alb12345672 Жыл бұрын

I have a dorman on my 98 MGM for 8 years now, almost 100K. Just needed a part delivered the next day so I can install and go. Don't really care about extra power but it may get a bit more gas mileage with this intake. These years must be modified a bit to take the Ford Intake, didn't want to mess with it..

@neilbrown82 Жыл бұрын

@alb12345672 lol it's easy af to put a pi intake on a non pi engine

@alb12345672 Жыл бұрын

@@neilbrown82 Maybe in the 98's next life :lol:

@straydawg13 6 ай бұрын

TRQ and dorman manifolds are trash Imo I've seen 3 of them fail within a year, either huge vacuum leaks or coolant leaks... Poor quality control I guess

@williamking9200 Жыл бұрын

My car had a ugly missfire on cylinder 1 and 5 when I bought it. Turned out the intake gasket was letting coolant pass through into the runners. So I bought a Dorman at Orileys because it had lifetime warranty.. At first my car ran great, gas efficiency was way better and the miss was gone but after awhile the miss is back. I replaced the coils,plugs,fuel filter,cleaned the maf and it's still missing so im betting its that Dorman intake failing again.. Going with Ford next round..

@neilbrown82 Жыл бұрын

Also use only oem Motorcraft coils

@MrDino27 Жыл бұрын

It started leaking in the back every 6 months with the dorman THERE CRAP

@P71ScrewHead 8 ай бұрын

Never doubt Ford, unless they offer you candy in the back of a van..lol

@thenegus5469 4 ай бұрын

Good luck they stopped making them. I’m pissed

@QZPZ 2 ай бұрын

The Dorman didn’t perfectly match my heads and also caused a misfire. You might have that problem.

@droppedf100 Жыл бұрын

Only thing missing was the price difference. But ford is better in all areas

@kb01663 Жыл бұрын

This makes me very mad, when i bought my car it had the dorman intake. I feel like i've been cheated, but I'm gonna be getting a Kenne Belle so I guess the gains will be even better

@GrandPitoVic Жыл бұрын

You can feel a difference with those thinner runners. They are thinner and you can feel the power loss.

@GrandPitoVic Жыл бұрын

I puked it right back off and put a new dealer intake back on.

@boogieman6522 6 ай бұрын

My Dorman has that crap on the bottom It makes you have to remove the intake to change the heater hose that comes of back the water pump

@bmaccccc9 Жыл бұрын

Ive worked for Dorman for 6.5 years now and am restoring my fox with a mix of LMR and Dorman parts. When I saw the Dorman name on the video I got pretty excited. Super cool to see the dyno results!

@robsorgdrager8477 Жыл бұрын

Are you to blame for the less than " lack luster " performance.

@bmaccccc9 Жыл бұрын

@@robsorgdrager8477 i deal with steering and suspension mostly. But its things like this that we need to see to make sure our parts meet the right standards. Regardless… i made sure the right people saw this video.

@robsorgdrager8477 Жыл бұрын

@@bmaccccc9 I ran into issues with these when building my Vic and then started seeing the exact same issues on my customers cars. The air fuel actually freaks out to the point of causing misfires at highway cruising speeds. I swapped the dorman out for a fomoco perf part and AFR almost instantly plopped back into spec and fuel trims came back to normal. Normally I use moog or dorman as I have learned to trust the parts and most times the dorman parts are better than the manufacturer. As a mechanic I understand that sometimes stuff happens and it's to the fault of the universe. I would assume if dorman fixed the runner cross section it would be equal to if not better than the Ford part.

@bmaccccc9 Жыл бұрын

@@robsorgdrager8477 before dorman i was a tech myself and 100% understand. When i started there it was refreshing to see what they really do to fix anything they put out there that isnt meeting atleast OE standard. If you are interested… we have a facebook forum if you want to join. We talk parts, issues with our parts, what you liked and what can we improve. Techs do voice their oppinions on our parts which is not always positive, but its a great learning experience for us to improve and fix whats out there if we were not aware of it.

@robsorgdrager8477 Жыл бұрын

@@bmaccccc9 that's actually pretty cool. I my giver a look 🤙✌️

@hermanrogers1325 Жыл бұрын

Now I can tell the difference pi have deeper runners

@marine0331inf Жыл бұрын

Ford hands down...

@Jsta2v_racing Жыл бұрын

I just skipped both and went to the edelbrock victor jr intake 🤷🏻. But that’s me lol

@averagemanhempgars502 Жыл бұрын

Where u get it?

@Jsta2v_racing Жыл бұрын

@@averagemanhempgars502 summit racing I believe. Several places sale it. Just have to google it.

@averagemanhempgars502 Жыл бұрын

@@Jsta2v_racing thank u

@Jsta2v_racing Жыл бұрын

@@averagemanhempgars502 np

@sategllib2191 Жыл бұрын

I got a bullit intake. I bought a dorman back In the day then ended up buying the bullit thankfully

@scotteric8711 13 күн бұрын

Geez. Idk how the ASE haven't banned the Dorman intake from use in repair shops. That's almost criminal. How can you call a replacement part something that leaves it worse than during the original failure?

@latemodelrestoration 12 күн бұрын

ASE has no say-so on after market parts, but I know what you mean. -Landan

@Fast85FoxGT 12 күн бұрын

Of course the FRPP intake is sold out everywhere and people are asking crazy amounts for used OEM units. Just sucks. My car is FBO, tuned, geared and I know I am losing a good amount of power because of this dang Dorman manifold. Makes me sad.

@churchking2527 8 ай бұрын

I'm not 100% certain the power loss is as measurable on a stock car. That car had high flow exhaust and 93 octane tune, so I could imagine the air intake capacity could be a lot higher than stock. You might get a power loss with boltons, but not necessary with stock intake, cats and exhaust.

@P71ScrewHead 8 ай бұрын

Modded or not, it's a shitty intake n you'll be sorry you wasted your time n money on it..

@churchking2527 8 ай бұрын

@@P71ScrewHead They don't make the PI one anymore, and the trickflow requires additional modifications, suffers from heatsoak and doesn't give the same powerband either. Even the Ford PI intake is going to split again.

@juansabal9995 5 ай бұрын

I’m owned a mgm totally stock with dorman intake and it’s noticeable the loss of power at top end.

@TheNightmare692009 7 ай бұрын

Heard a rumor that the Ford Racing PI intake will no longer be produced. Checked LMR's site and its out of stock. Is Dorman our only option now for a new plastic intake?

@latemodelrestoration 7 ай бұрын

Rumor - "A currently circulating story or report of uncertain or doubtful truth." I don't know the complete story as to why it's taken this long to see these intakes by in stock, but as of now, Ford Performance has not discontinued the intake. I'm not going to speculate or give you false information. Sign up for in stock alerts on our website and you'll be notified as soon as they're back in stock. Thanks. -Landan

@muscleeveryday 7 ай бұрын

@@latemodelrestorationeveryone’s out of stock :( I need one bad

@utilitycow 5 ай бұрын

@@muscleeveryday What did you go with?? I'm looking at Autotecnica FD1413042 but can't find any reviews. Summit website says they will special order the FRP but I doubt it.

@thenegus5469 4 ай бұрын

@@latemodelrestorationPlease guys. If its true you guys should make a replica with exact dimensions

@loveracing1988 2 ай бұрын

@@latemodelrestoration Considering your page says you don't even carry it anymore I'm going to say the rumors are true.

@67cudaksa34 Жыл бұрын

6 months after this was made, they no longer sell the ford instake

@Mustang5L5 10 ай бұрын

And now it looks like the manufacturer who made the PI intake has ceased production. No more Ford Performance manifolds to be found. What is one to do if stuck with a Dorman and down ~20HP?….other than Coyote swap 😊

@latemodelrestoration 9 ай бұрын

It's still a 4.6L 2V. Just kidding. The Ford Performance intake manifold hasn't officially been discontinued. -Landan

@P71ScrewHead 8 ай бұрын

@@latemodelrestoration Oh, you just kicked me in the balls with that joke.. Here i am building a future Coyote killer 4.6L 2v..lol

@latemodelrestoration 8 ай бұрын

@@P71ScrewHead Go for it! To each their own. -Landan

@P71ScrewHead 8 ай бұрын

@@latemodelrestoration Yes sir..

@stevenhanna6973 Жыл бұрын

Get the original them self tapping screws doesn’t hold up very well when changing coils

@mercedes-amgforlife3237 Жыл бұрын

Changed a many of these on Crown Victoria's, and those screws are crap! The OEM(if available) or the Authentica brand is the best bet. I got so good at changing those intakes I could do the complete job, and have the customer out the door in 20 minutes using no battery powered tools. If Dorman was what they wanted I would put a thin film of gray RTV around all the intake and coolant ports to prevent leaks, as I had one leak coolant at the rear from the improper design.

@alexmontanamc 11 ай бұрын

Ok but Ford isn’t really selling the good one anymore, so really what’s the next option for us? My intake is jacked up, and I refuse to use the dorman

@Dalton2v 9 ай бұрын

Same

@hermanrogers1325 Жыл бұрын

I am going to take my dorman intake manifold off and give it to the thrift store and buy a new intake manifold pi from ford or LMR or America muscle

@hermanrogers1325 3 ай бұрын

That doorman intake is nothing but a check engine light po 300 with 301

@ViperMods_216 Жыл бұрын

All I took away from this video is that we need to save the disappointment and just swap a 7.3 Godzilla and forget about the 4.6.

@MrDino27 Жыл бұрын

Well it's all installed my car has never ran so well .Its silent at an idle .Pulls like landin says .Thanks Glad I got one .none left now .

@VJBaller-jd8mq Жыл бұрын

Anyone able to find the Ford ones? All places out of stock

@latemodelrestoration Жыл бұрын

VJ - Ford's supplier for this intake is having some issues getting certain material to make the intakes. We have some more intakes on the way. It's a first come first serve basis, so sign up for in stock alerts via the product pages. I'll provide the links to both Ford intakes. Please let me know if you have any questions. -Landan Ford OEM: lmr.com/item/LRS-9424AB/ford-mustang-pi-intake-manifold-99-04-1w7z-9424-ab Ford OEM w/ FPP Branding: lmr.com/item/M9424P46/999-04-Mustang-Gt-Pi-Intake-Manifold-Requires-Lrs-10153A

@juansabal9995 5 ай бұрын

Summit racing has it

@professorXPM Ай бұрын

god dam dorman.

@mathewhoffer4541 Жыл бұрын

What he really did not do is describe exactly WHY the doorman is a poor choice and a non performance intake. When ford redesigned the 4.6L and came out with PI heads cams and Intake the PI intake has larger runners. Dorman had already made the 4.6L replacement manifold and instead of redesigning a new PI intake for the PI engines they kept the same NPI restrictive runners from the original design and just changed the last 2-3 inches where it bolts to the heads with the newer PI design. so when you buy a doorman PI intake for your PI application you are simply getting a NPI intake that bolts up. Avoid this turd even if given to you the dyno clearly shows that it is a poor alternative.

@P71ScrewHead 8 ай бұрын

They made too many, maybe that's why..lol

@carstereoAAC 5 күн бұрын

And here we are in 2024. Cant even get the Ford OE intake. Just the garbage Dorman one. Not sure why Dorman would make it that way

@hahaha12345678993 Жыл бұрын

in my opinion both are garbage plastic or composite material that crack, i bought a new ford racing one, it only lasted me 5 years before cracking. now i'm thinking about just throwing a cheap dorman one on, at least i can buy 3 of them for the same price that the ford racing costs in todays post-covid parts shortage world. i see these dormans go for a 100 or so on fb marketplace

@newedgegt1947 Жыл бұрын

When the nipple for the heater core broke on my stock manifold.I went to Ford and bought a brand new Ford Racing manifold never run that crap dorman it doesn't run right with it 23hp lose no thank you. These cars already make low hp to begin why run garbage..

@jodyoverdoser 8 ай бұрын

Get a Typhoon and it will last forever

@willsrestorations 9 ай бұрын

I'M JUST WONDERING HOW ANYBODY IN THEIR RIGHT MIND WOULD EVER USE A DORMAN PART FOR ANYTHING ON THE VEHICLE. NOTHING BUT STRAIGHT TRASH EVERYTHING THAT COMPANY SELLS