C4s owners

Just doing some research for a friend looking to pick up a C4s what type of power are you guys seeing and what mods have you made to achieve those numbers thanks in advance.

Unfortunately, you will not find a lot of modifications made for power here. The concern many have is with keeping the motors together at standard power levels and as a result, most are modding for reliability, If modding for power is a pursuit your friend is looking to take on - if they decide to do it with a NA 996, they will be part of a pretty small group - maybe going with the Turbo car would be more their style. Hers's a pretty good recent thread discussing some pretty common mods and it even has a dyno graph in it which is a very rare occurrence here - should tell you a lot about how important outright power numbers are in this forum. https://rennlist.com/forums/996-foru...st-intake.html

If shopping for a 996 and adding more power is the primary goal I'd suggest looking at a different car. As zbomb said, with the M96 motor, addressing issues that have to do with reliability/longevity of the motor are primary goals. It's also much more difficult to extract more power out of an NA motor than a turbo one. If he's set on a 996, I'd perhaps suggest finding a roller and building an engine. There are a a few reputable options out there that will build a well sorted motor that will pump out more power than a stock M96. Can I ask the reason behind wanting more power? Will this be a track car or a quarter mile drag car?

I own a 4s. I drive it extremely hard. Stock power is more than enough to get anyone in trouble and in 21k miles I've never thought �if i only had more power...�

I believe all the posts above to be correct. A rebuilt, larger displacement engine with the pitfalls of the M96 sorted out would be the answer. Of course with that money, you might just buy a Turbo.

Does an FSI 4.0L engine count as a mod? I�ll let you know how the power difference feels when I get my car back next month but as someone said above, the car was plenty powerful and a blast to drive beforehand. I did the new engine so I�ll have a car I can hopefully keep forever. Having owned a C2 and a C4S, the big difference is the steering and handling. C4S has a much heavier steering feel and doesn�t have the pronounced rear end pendulum feel when taking curves spiritedly.

I have a buddy with a 550HP Mustang Shelby. I do not have any trouble keeping up with him. I�m sure he�s way faster in a straight line. If you want big power the 996tt is the way to go. The stock 996 would require a lot of money and time to get modest power gains, and there are still downsides to this engine design (bore scoring, tensioner pads, cracking of cylinders, IMS bearing, oil system, cooling system) that make it an undesirable candidate for modification unless you rebuild the whole thing (to including a bore/stroke change), cams, etc. A rebuild like this to get the Turbo levels is probably $25-$40k or more. Hence, buy a turbo and get the same power with great residual value (your turbo will likely not go down in value).

997 X51 Headers X51 Oil Pan Fabspeed 200 cell Sport Cats Fabspeed Sport Exhaust GIAC Evo Chip RSS intake Plenum Dyno was done after those upgrades.(Shell 91 oct gas) I now have the engine Rebuild from 3.6 - 3.9l nikasil liners but don't have a dyno for it. It is much better then it was. Now you can feel the power. I had some Audi A6 (335 hp) try and keep my from passing and I was able to over take and pass him with ease while mostly in 2gear and changing to third as I pulled back in lane in front of him by 4th I was so far ahead he gave up.

I have a FSI 3.8 Street Performer in my C4S. While I prefer not to discuss dyno numbers it is much more entertaining to drive than stock...read previous as "it is a Rocket ship!"

Quotes source post: 16925391

May I ask why ?

Stock power is more than enough and I would concentrate on sharpening your handling. I have GT3 suspension bits/control arms/etc and re-valved PSS10s and it goes like stink with stock power (no mods other than brakes shoes and suspension) Now, with the 4L engine, it is an absolute animal. This is what a cayman GT4 feels like now that the handling is matched by the power.

Quotes source post: 16924851

In the interest of full disclosure, i did go for more power with my 2nd 911, a 997.2 4s with a FSI 4.0L Stage II engine. Next spring after its post-break in I intent to post some videos comparing and contrasting the stock 996 4s to the 997.2 4s with the far from stock beast of an engine. Eventually the 997 will see some track time, something i want to save my 996 from.

Quotes source post: 16925499

Dyno numbers can be argued and different dyno's and programs can change the results. Dyno #'s are just that, a number. How useful is that horsepower/torque? Is it all in one area that doesn't necessarily make the car faster or more usable. IMHO hp/torque through a wide range of rpm is what makes a car for me. I.E.: I don't care about a huge number if it is in a narrow range and way up on the rpm scale because I may never use it. I used to race cars and that is a different story. Mine is a street car. I've seen the dyno #, it is impressive compared to stock and very usable. All I will tell you is my butt dyno tells me it is much stronger than it used to be.

Quotes source post: 16926031

Fair enough. I�d me more interested in seeing the curves and AFR if it was logged during the pull.

Great info guys he is a fan of the brand and the turbos have gotten a little out of reach price wise. The car wouldn't be an everyday driver but would be a weekend warrior not beat on but spiritedly driven and canyon carving. The other option is the XKR Jag it has a bit more power but he likes the look of the 996s-997s I think the 911 is more of a pure performer than the Jag but the XKR has the sound and the power like a British muscle car. Thanks a lot guys great info and forwarding this over to him.

X51 here. Initial tip in feels like a regular 996 3.6, but the X51 has more robust pulling power up high in the rpms. For a 17-year old car, there are very few modern sporty cars that I can't keep up with or leave me behind. Just did a 1300km round trip road trip keeping to undivided highways, it was fun to pullout and pass a train of 6-8 cars/suvs by dropping down a gear while a much newer Audi S5 tried to keep pace, but had to duck back in 3 cars in. It's still amazes me how quickly I can be in "roadside vehicle and license suspension territory" by simply squeezing the throttle! As others have said, plenty of power in these old girls with the best hips!

I used to have an x50 turbo (highly modded), and recently looking to get back into a 996. Was considering the C4S car as a good base, VF supercharger maybe. I'm not necessarily all about a big high HP car, but I do have concerns about a C4S feeling a bit anemic. Nothing to base that on other than personal feeling. Any ex-turbo owners turned C4S owners out there?

I imagine most cars will feel anemic when compared to a 996 Turbo so that is no dig. If HP is the game though, why even get a 996? If you were to get a 996, I would think you would want a C2 since lighter and maybe a smidge faster if you want to go that route.

Quotes source post: 16933142

I currently own both 3.9l C4S and a 996 Turbo. Nothing come close to the power of the Turbo it is a beast. I love the C4S but it lacks 200 lb of torque. I woulnd never supercharge or put a turbo on a m96/97 engine just going to end up bore scoring it.

Pretty much what jumper said. There isn't much focus on power for 996s outside of turbos which can make serious power. My c4s is not a fast car in a straight line by any means and can feel anemic if you've driven any modern car with more than 350hp. Really isn't the purpose of the car though... I still have a blast driving it. It feels much quicker!