from what I observed with the 911 doing just a V splitter IPD plenum with the stock throttle body, there's no notable gain by doing so, no. The gains are all from the larger throttle body.

normally I'd say yes, just to avoid occasional MIL. But, I've never had good luck with the porsche tuners, so nah.

metalguyn get headers no such thing as max out on power . Get new headers should give you extra 10-15 hp depending on brand . Plus look into makeing the vehicle lighter makes a huge difference ..

the stock manifolds are very restrictive.

no need to do so.

this should work on any E-Gas M96 boxster I'd think

well, plug and play at least. definitely requires some modification here and there. worth it though. car is MUCH more responsive and pulls quite a bit harder.

also helpful. I had headers and decat test pipes on the car after this. depends if you're after response or power more.

I already feel the throttle response is good as it is, so I'd say power for sure Are headers the way to go?

I'd skip decat headers personally... theres a top end power gain, but the car gets STANKY

You'll need extenders on the 2ndary o2 sensors to prevent CEL if you decat or run 200 cell or less

Considering using Spectre 8741 3 inch flex tube. Just read some positive reviews. Should be safe for a NA.

I don't see why it wouldn't work. I prefer the rigid metal tubing personally but ymmv.

no idea. bought used out of a totaled box

84 is GT3 this is the C2/C4 THB 74mm

Thanks

Ovalbore how can I tell if mine is an e-gas. It’s a 99

easy google away. sold the car 6 months ago, so no help here.

no, the 911s had decent sized stuff to begin with and most 3.4s weren't e-gas

should work on any e-gas 986 yep.

It turned out that, the leak was at the bottom of the aos.

RMAX gaming throttle body

Maybe you ha a tumor bro.

thats not an E-Gas car, so I doubt the process works

the 2.5 cars will never be 'fast', heck even the 3.2 isn't that fast. This mod most notably gave me a MUCH more responsive throttle response. power is probably up 6-10hp around the rev range. One thing worth noting, this is ONLY for 99.5+ e-gas equipped boxsters. the cable throttle boxster you will need a throttle body from a 99 3.4 carrera (cable operated) and it may require some modification to the throttle cable as well. It may or may not bolt to this 997 plenum... Best guess on your car would be get a stock 99 Carrera 2 plenum and cable throttle body and just start trying stuff out till you find something that works and fits reliably.

You don't bother, our cars are slow and there's not much we can do save for swapping out the engine. You're better off spending money on a performance driver's education course

as long as it's an e-gas car it should.

no, this isn't a mod set you'd find sold anywhere as a kit.

Yeah it's called the IPD plenum which includes the molded one-piece silicone intake tube, hose clamp, 997 throttle body, four longer bolts, and of course the plenum made from aluminum. It's more expensive, but overall much cleaner and tidier looking and slightly better. Which is a better value? Depends on the individual's preference and pocketbook. I personally prefer the clean look of the IPD setup despite it being overpriced in my opinion. I sourced the 997 throttle body separately to save a couple of bucks, and purchased only the plenum and tube as a kit.

3.2l on the Boxster sport best upgrade to add air flow is the IPD or just plain and simple delete the air box and upgrade to a K&N 9.5”x3” filter with the guard. Also adding high flow cats and straight down pipes. My 3.2l kicks ass in LA and SGV!

not sure, you can get them anywhere though with the part number

depends if your 99 is a late 99 (e-gas)

if its an e-gas throttle body car, nope. the plug is identical between the 67 and 74. it will idle hunt for a while.

Thank you, yes it is the same plug you're right but it runs very rough and the whole engine is shaking and sounds very bad. Has 2.7L got the same computer system?

Christophe Bodart Sounds like a vacuum leak somewhere.

nah, you really shouldn't.

the 987 S should be a 3.4 liter. plenum is from a 997 C2. thb is from a 996 C4S the 987 S already has a big throttle body

Ovalbore thanks for replying. Unfortunately mine is a 3.2l. 2005 and 06 have the 3.2l. In 2007 then they upgraded to the 3.4L. Thanks for the info! I found the plenum for $75 online and a 74mm bosch throttle body for $190 which will be way cheaper than the IPD kit. Im glad i ran into your videos while searching KZfaq. Btw, does it set off the check engine light?

Interesting, I did not know that! In that case, I'd check to make sure your car uses the 67mm THB still before ordering this stuff, but it's great on my 986S. does not trip a check engine light. stock MAF, so the car doesn't know the difference. I think I found the plenum used for $26 and the thb used for $76 shipped. great value for dollar mod. haha

Ovalbore thanks bud! Great vid and great info. I've watched a few of your videos. Nice stable you got there. Love the e30 m3. Btw, ever figure out why your blown motor would turn freely in reverse and not forward?

haven't split the case. #1 rod bearing is the issue. guessing theres just enough clearance where the big end of the #1 rod is hitting the case clockwise but glances off counter clockwise. core engine is for sale on ebay.. we'll see if I get around to messing with it myself.

No, the GT3 uses an 82mm thb.

Since you put the 997 plenum could you buy a 997 ipd plenum and put it in there. Those guys have the gt3 throttle body. Thanks.

requires even larger, more ill fitting intake piping and that that point you need to increase the size of the MAF housing and tune the ECU. the bottle neck is no longer the throttle body with a standard C2 throttle body. this also cost a whopping $105 to put together and IPD prducts generally cost hundreds more than that.

haha, there are two F355s that live there -- the 97 Spider is mine. the 95 GTB is my uncle's. (the car I wanted, but could not afford)

Very cool! I just got a 348 Spider last October! It's been good to me so far! Love your 355...I watched all the videos you did on it in the past...hoping for more!

There's a quickie on the IACV in the queue right now -- more in the future, but really not a TON more needs to be done to the car. needs a soft top replacement. bought the HAARTZ canvas... MAY give it a go myself even though I'm scared of upholstery work.

Well that's good news that there's not much to do to the car! Love your channel though...you're so knowledgeable.

Agreed! I'll document the M2.7 engine out on that 95 GTB this winter probably as well. neither is documented anywhere. Thanks for subsribing!

3.6.

the IPD system fits better, has a pattented design inside that cuts the incoming air and redirects it to the two intake manifolds where the stock T piece just has a flat wall -- creating more turbulence.. and, uhh.. well that's it really. the IPD fits better, and the air velocity is probably faster and cleaner. That being said, I have an IPD competition on my brothers 996.2 with the GT3 throttle body, and the power gains on the boxster were similar through the pants as they were with the IPD and BBTB on the 996.

Thank you very much and congrats for the amazing videos

common. e-gas is 00+.

@@OvalboreCars thanks for the response. So is there a 74mm one with cable and not e-gas that I can use for my application? Mine didn't come with cruise control.

Also my 986 only has one connection between intake runners not 2

it was indeed a vacuum leak. ignition on without engine running will clear throttle map adaptations

not sure. throttle response noticeably improved. I'd guess this picks up 6-8hp pretty easily. Real world terms, that's more hp gain than anything except cat delete or muffler on a boxster S. Dynoing this is so difficult due to ignition coil location, otherwise I'd have done a before and after.

Ovalbore you can take the cats off? Off complete?

sorry, I dont recall. I sold the car years ago.

disagree. doesnt gain you anything, just changes the e-gas map to a logarithmic curve. That money could be spent on something that actually makes the car faster or more powerful.

because I wear watches?

It's an Apple Watch stainless. I wear mine everywhere too. Sapphire glass face doesn't scratch 😁

David Wilkinson "scratch resistance"

Why does your English suck ?....lmfao

How dos yoos speaks soos goods englishes?

Valentine ONE V1.8 pop / ESP

Nick Henno leftovers!

Honestly I never got the baseline Dyno done on the car -- I have also just replaced the engine so any numbers I'd post would be meaningless. butt dyno doesn't lie though, and the throttle response increase is significant. the car now has headers and midpipes, and it near neck and neck with my brothers 996 C2 3.6 0-100

I looked at the whole fab speed package. Exhaust.ecu etc About 5k in parts. Say 2k in labour. And it adds 27hp tops which is about 10% more than the stock 250hp on my boxster s. My mechanic at ktec said. Money would be better spent on a 13k Evo 09 and for a few kgs you can crank it to 500hp!I'm still keeping the boxster. After 15 years she's the best gf I've ever had...well most reliable anyway!

Agreed. the 986S is a rare case where porsche put small undersized parts on to keep it from nipping at the 3.4 carrera at the time. most models have nice big throttle bodies and decent headers. the box S uses the 2.5 liter throttle body and 2.7 exhaust manifolds... it's relatively easy to pull an additional 10-15hp out of it with these simple changes.

something that's actually difficult to view, meh. on a 911, sure.

@@OvalboreCars a clean engine is a happy engine. Just saying. Every time I ever go into the engine bay on my 03 Boxster S I clean it while there. My car appreciates it and therefore I get loving returns from her. No IMS issues (small percentage anyway) because I take care of details. When I need a clutch, I will do the IMS change then but not until then.

cheap old 986 doesnt make sense for a $1,400+install solution.

I just did a clutch on my '84 Carrera Cab for the cost of parts and time -original rubber center disc disintegrated. I understand on a Boxster the trans is dropped to do ims and clutch etc. I got this '97 Arena Red Boxster with 72k miles with hard top for $3,500 on a whim. Just needed maintenance from sitting and some clear coat fixed. It's certainly worth the upgrade and effort. It's well put together and a flat six! I can fit into this Boxster but not a 914. Win, win. I think the 2.5 is a nice revving little motor.

it was 80 some degrees and the vehicle had been driven under an hour prior. kindly show yourself out.

@@OvalboreCars blah blah blah

IPD non comp dont make any difference. this made a significant difference though due to the much larger intake cross section.

@@OvalboreCars right !! I didn’t realize how much smaller the 986 intake/TB was .. I agree with you I have a 997 so same 74mm TB as a 997

Probably like a bee or something, I don't know. Sometimes technology sucks ass, we move on.

you're a moron. 80 degree ambient temp, engine still had latent oil heat... and it wasn't a high rev. if I had pegged the limiter, sure. 4k aint a big deal on a marginally warm engine. take your keyboard cowboying back to a forum.

wow, thank you so much for this insightful comment! I reviewed your (lack of) uploads and found you definitely have a much better content creation style. very happy to take that criticism of a free video made be some random person on the internet that owes you abso-fuckin-lutely-nothing to heart!