Bolt-ons won't get you 40 hp at the wheels. From all the dynos I see, you are lucky to get 20 rwhp out of an intake kit headers and exhaust. Even adding a crawford intake manifold, UDP and a Technosquare ECU hasn't got anyone 40 rwhp. This is only a good start. If you really want to serious, bypass the shorty headers and go directly to full length headers that elimiate the cats.

To push the envelope, you will need to get into the engine. Every point you can bump the compression is worth 10% more power. There is unfortunately a limit for pump gas. But moving from 10.3:1 to 11.3:1 is reasonable with a set of dome pistons. I don't think you could mill the heads enough to get this without running into piston-to-valve clearance issues. This is the same compression ratio that type 996 911's run. Next cams are a must, but to get them to really work you will need headwork, valve springs and port matching with a custom ECU. The injectors will probably need to be upgrade from the stock 315cc to 370cc(Z32 TT) or 440cc(SE-R) units. Figure to be working with a 7500 rpms limit with this setup. The cams with headwork and proper tuning are worth 50 fwhp alone. For power, if you use the right cams, have the machine work done right and tuned right then expect to hit 300-320 rwhp. So what would it cost to do this feat? About $10K or over twice what that supercharger kit costs...and yes the bolt-on supercharger kit(Vortech or ATI) on a stock car is still faster.


04' G35 Coupe(finally in the garage)
6-sp Diamond Graphite/Willow w/Premium