4.5L owner here 👋🏼 Had my GT4 converted nearly exactly a year ago (including new gear ratios), and it’s everything Matt said in this review and more. It’s a much tauter, more involved car now, with heaps of torque everywhere in the rev range. Absolute rocket ship compared to the stock 3.8L, and Rick is a class act that has been amazing to work with. If you’ve got a GT4 and are considering bolt-on power adders, you’re truly wasting time and money. Instead of spending $18-20k on exhaust, plenum, runners, throttle body, etc., you’re genuinely better off banking a few extra dollars and sending your car to DeMan; you’ll be getting a complete package that has proven performance figures and requires zero guesswork from you.

DeMan had me at 100 pound feet more than a GT3RS!

I really love how Hagerty has stepped up their KZfaq game these days. So many great shows.

Hagerty team is changing the YT game. Basically, the all stars. 🙏

Matt must’ve REALLY liked this swap from deman because he bought a Spyder so he could have it done

THANK YOU HAGERTY FOR SWINGING FOR THE FENCES! We love all the new shows! Especially Matt and Jasons!

Well this has been added to the list of cars I'd buy with lottery money.

Congratulations to DeMan Motorsport for developing the perfect drivers car

Great episode, I’m drooling! It would be even better if you featured a “just the noise” clip at the end just like in some of Cammisa’s shows. I bet this thing sounds MEATY.

Great to see the old crew working on stuff again. JF, Matt, Tom. You guys still get it done.

I recently bought one of these on the secondary market. This one is a 2016 981, DeMan converted in early 2021, with the LimIted Slip Diff and the shorter gears. I am stepping up from a heavily modded 991.1 911S coupe. In comparison, the DeMan GT4 is a pure sports car, with no daily driver aspirations. It’s much less comfortable, it’s loud, and it demands focus, not to mention the manual gearbox. So much more visceral. A real drive. This one dyno’d at 554 hub horsepower. My 911S is about 370 to the wheels; the bigger power supply is definitely noticeable. Looking forward to getting it on track.

I've been waiting for weeks to see this review. I had the pleasure of visiting Rick and Mattie at DeMan some weeks ago. I was taken for a ride in this very car, keep in mind at that time I owned a C6 Z06 (heads/cam/intake/fuel system/flex fuel/exhaust 618whp 9.9@141mph siting on LG Coliovers/Swaybars and R888R) which wasnt and isn't a slow car by any means. Rick took me for a spin on the same road you had closed down no less. I was blown away, it felt like a V8 was in this car. Keep in mind I have a 997 Carrera S with a LS3 swap making 445/435 to the wheels. That GT4 felt like a mini Z06 with attitude and power for days. The gearing just exploits in total perfection... The car you drove was for sale and I was soooooooooo tempted to buy it. Alas I grabbed a uniquely spec'd 991.1 Turbo to play with. But man this car forced me to recalibrate my thinking on whether I needed outright power or the combo this package offered. I may regret it but I am tempted to just have all three cars and be broke LOL. Great review, awesome team at DeMan for sure and the amazing cars they have laying around is crazy. That 959 for instance LOL

This thing sounds NUUUUUUTS! 👀🔥

Ever since I heard Matt talk about this car on his podcast I’ve been waiting and well well worth the wait. This is the Porsch you need

As a 981 owner I’m straight up drooling 🤤

Can see the DEMANd going up for DeMan Motorsport mods already

That video was awesome! I've driven the 4.5l and it is legit. Deman has been building engines for a long time so they know what they are doing and this is a beast of an engine, makes the GT3 feel like an s2k. This engine has so much punch you can spin the wheels in 3rd without trying 🤣

these cars are wild from the factory, I can't even imagine what its like with that motor. very cool!

I love when these shops expose how much automakers hold back in order to trickle performance over a longer period of time and sell more. Kudos to the engineers that make these cars what they should be.

That is incredible, very good to know that someone is doing this

I’ve got a Deman 4.5 GT4 and I love it

OMG YES! I'm glad ya'll featured this car. I've been looking forward to getting this soon

The shot coming accelerating out of that left hander had me crying. Ohmaagaaaawd!!! 😍 I also imagined for a long time what the Cayman could be, if... ⁉️ Thank you for this Video!

Excellent! I've been drooling over DeMan's builds for years. You guys are really stepping you game up, and I love it!

turned up to eleven, this thing is nuts. Pure love, that sound.

The design and looks of this car and engine and the overall concept are like a Picasso. Either you hate it or you love it. I call it a masterpiece that was created by love and passion for the profession. But above all knowledge that develops into something. That something is what you see and it rolls on four rubbers. Called the masterpiece.

Now that's a Cayman the way it should be. Close ratio gears are so much better for that car than the long ones from the factory.

My 2020 GT4 needs this ASAP! Wow

Love this video. And I love the “casual” 959 hanging out on the lift in DeMan’s shop

This 4.5L GT4 is my new favorite Porsche! I was really looking forward to the 992 911 GT3 but DeMan (the man) remapping the gear ratios, installing stronger clutch, new exhaust system & boring engine to 4.5L on the new GT4 must be a totally sublime driving experience! Well done sir!

Great video and fantastic car. This reminds me of the Ferrari 458, a sexy 4.5L 9K-RPM mid-engined V8 beast that will put a huge smile on your face and turn heads all day. It's no wonder they used it to design the new Z06.

Matt stuffing himself into a tiny car again to do God’s work. ✊🏻🏎🔥

For 6 years I read and hear that it is impossible to shorten 2nd gear in these gearboxes because it is on the shaft. Turns out it is possible :)

Sound of that thing reminds me of the 911 GTLM car from 4 years ago. The sound is amazing!

Best sounding Porsche (racecar or otherwise) I have ever heard!!!!!!

Finally the Cayman gets the love and frankensteining it needs

For all those curious, you can do the same engine work to the 997.2 gts / any 997.2 carrera I already reached out to DeMan

Rick seems like a genuinely nice guy and very talented in what he does. I’d be confident in him working on my GT4. Hagerty is doing a great job with these new vids,

I’ve driven that road, and I’ve seen the development of the GT4.5. I’ll tell you now, that road is a challenge for anyone, and it shows that that Cayman is a beast! I’ve been to DeMan Motorsport a multitude of times and I can personally say that their work is UNBEATABLE in the Tri-State,NJ,PA area!

959 casually up on the lift in the background of the shop. Flex.

6:32-6:42 is the greatest 10 seconds in KZfaq history. I could watch that cold start a hundred times in a row.

This is so cool! The Cayman GT4 is such an excellent car, so cool to see it getting maxed out to its potential! Amazing car! Great video and well done DeMan!!! I have a new favorite hot rod now!

The best Porsche potential video made by the best automotive crew from The Drive Channel. No wonder I loved this so much!

OMG that Cayman is just epic, and it sound so good, better then a GT3, I think so. Allot of want with this on.

I love Cayman love. These cars need their due.

Perfect road ,perfect weather ,perfect car......As an illegal alien working in the USA ,from 1989 to 1998 ,I bought my first Porsche (911 SC) and took it on long road trips ,after a hard working summer , like NY to Montana on such roads ,brings back fabulous car memories...Thanks.

Best episode yet. We'll done Matt and crew!

Oh my word that sound is absolutely off the charts! The sound is closer to an RSR car than to your average Porsche GT car. I don't wanna know how much it costs though.

Holy cow they really did close down that road. I was still remembering Matt's canyon videos and somehow thought the disclaimer was similar in nature to "filmed in Mexico". I just recently found this channel and I like what I see so far.

Perfect car in the right size. Thanks for the video.

I have to say this is an amazing match up. Matt taught me how to drive stick from a tutorial back when he had his Ford Focus RS. Good work

Matt acts like my deceased uncle seeing a vídeo of this guy brings a lot of memories , plus the reason I know Matt is because of him , every show this guy has the chance to talk I listen very closely not only what he’s saying but what he’s feeling and expressing

This is the right way to do it. The man has thought through the motor and gearing to create something that functions like factory, but more on edge for a driver that cares more for the times between corners than between stoplights.

Oh it’s TUNED with Matt... Wait no, now it’s MODIFIED I’m totally okay with this. More please!!!

Ive been following Deman Motorsport for a few years now. Ever since i saw what the 4.2 L car did to a GT3 RS at Sebring ive been hooked. This is the car Porsche SHOULD have built. If Im ever able to afford one, best believe Ill be taking a trip to upstate NY

Gotta be 1 of the best drivers cars out there today. Brilliant video!

As Porsche and car speculators drive up the price of the GT3 this modifications makes more sense each time I watch this video.

That puts it over the line, I’m getting a GT4 and doing this. Hey honey, I have something I need to buy....

So sick. Nice piece Matt.

easily the best sounding gt4 I've heard wow

My dream car is the Cayman GT4... I think I know what I'm gonna do to it in the event that I get it one day. Turn it into a 4.5l engine. That thing is sick

This car DeMands respect. ..... I'll see myself out.

The 924/944 was doing this with the I4 back in the 80s. Torque was instant with those.

Sounds like a 911 RSR (after the 2017 exhaust uncorking). Absolutely glorious!

The sound it makes is music to my ears!

I can't believe the engines can take this kind of modification. What an amazing car.

Bro Bro Bro... the sound on that stroker... gotta get a Poster with sound effects ot that!

DeMan is The Man!! I need this car 🚀

2:08 "Drop in a crate engine".......3:30 "Bore out your engine". Glad to see you are as inconsistent as always. Never change Matt. BTW DeMan been doing this for 3+ years, they do amazing work and their development is without a doubt, without shortcuts. But its worth mentioning the base cost of the mod at $28K to $35K depending on end results. Also worth noting the Porsche 718 GT4RS is expected to come out this year. With a 4.5L, PDK and 500hp+. With an estimated average cost of a new 718 GT4 at $99.2K + $28K in mods and loss of factory warranty, and you are about where the RS is expected to sell for. With warranty. A used 981 GT4 like mine can be add for about $85-90K. But worth consider it if I could keep the original engine unmolested and have a drop in a CRATE engine. That would cost about $15K more than BORING out the original block. Or if you blow the engine out of warranty, and if the block is salvageable. This is a great option.

That's a proper monster of an engine.

Matt excellent vid as usual, sounds like DeMan knocked it outta the park, No Replacement for Displacement!

I love the 718 Cayman GT4 as it is still Porsche's smallest car. I love what DeMan has done in developing this car to a higher potential than Porsche ever will against its stable mate, the 911. This now makes for a smaller, faster and more powerful package that is more enjoyable.

Would be nice to see a face off on track even though I can't imagine it getting even close to a 991.2 GT3 RS. Amazing car though, not taking anything away from what Deman has achieved. Matt on point as always.

I've always loved the Cayman! The standard GT4 seems pretty great, this is something else! I love the way that this sounds going through those short gears! I imagine this is also very expensive! If it can come in under the cost of a new GT3 that would make this the Porsche to have!

That 959 on the lift at the back of the shop. Nice!

Gotta say, this Hagerty channel feels a lot like what Drive used to be back in the day. Love it.

I remember when Porsche first introduced the Boxter, and the first thing I thought was how smart a step that was from an engineering perspective. And, when they introduced the Caymen, I thought that it's it!!! A modern day Spyder, open top or as a coupe. I love this car! :)

Nice little peak our Catskill back roads. They are the reason I own a Cayman. That run through Harriman is a blast.

510 at the wheels? My 986.2S only makes 258 crank. That paired with the short gear set has got to be glorious!

I recognize those roads. Harriman State Park. Some of the best driving in the whole state.

Matt revealed this week that he's bought one, it's that good 😎

Dear lord that sounds amazing!!

I love how the livery mimics the tarmac

After this video, this tuning shop is going to get a lot more Deman(d) for their work.

I had the option of buying a pre-owned Porsche approved 911 Turbo S, but I bought a brand new 718 GTS (the GT4 is a bit too much for daily driving...). That's how great this thing drives. With 500HP, this thing will be untouchable.

Everyone should hire Matt. Hagerty is wise. This is literally the car of my dreams

OH HELL YEAH...Hagerty brought back my favourite show from /Drive. Hagerty, it's official. I love you guys.

freakin wicked. sharky might have to dip into his bag of tricks. only problem is for anyone who wants a motor like this for a backdate will spend the same amount as buy a gt4 lol... seriously this has to cost 50k in crate engine fashion. i googled porsche engines couple days ago. holy balls! 187k for 918 motor.....still this guy has to be so epic. awesome video as usual matt. cheers

Doing a great job Hagerty! Maybe the best automotive videos on you tube!

Amazing car! I'd say the music was a bit loud at times, and REMEMBER it's a car vid! When you have exhaust noise as sweet as the Cayman you don't need music. The only music we're here to hear is the car.

Really good video but maybe a little bit overedited and overcut, we like Matt - that's why you got him - let us listen to what he has to say.

987 roller for $15,000 plus. $5000 coilovers, GT3 control arms, brake upgrade, and this engine with a reworked gearbox would be one insane Porsche for under 70K.

I definitely can't afford one of these, but I'm pretty sure I can afford to upgrade a 987 to a 3.8. Thanks for confirming that's an excellent idea.

In that form quite possibly the best drivers car that exists today!

Best one yet! You rock Matt.

Nice Video. Production quality and content. Both A+

Always liked the Cayman and it can handle almost anything on the Nurb.

I may travel to the States to get this done to my 2020 once she's out of warranty. Thanks Matt and Mr. DeMan.

I’ve been waiting for this one

Nice! As a 911 owner who loves Boxsters, this is what I hoped for when back seat for kids is no longer a requirement. My last thoughts to someday bother with a used Ferrari are almost crushed entirely