[hhsrx]

before you spend your money remember that what increases HP decreases torque. it is the low end torque that gives you the perception of speed with accelleration. If you decrease the resistance to airflow and change the intake length and volume you may detrimentally decrease real world performance and perceived performance. The numbers that are given on dyno testing are derived at WOT and most of us do not drive that way. I had a conversation with Steve Dinan while riding in one of his cars. I was ready to drop 1-2 K on mods giving me 28 HP when asked if that would give me a perceptable change in accelertion his answer was no.

 

[hhsrx]

having been down this path before i have never felt a difference in performance before other than with a supercharger. when looking at the most restrictive point ask what diameter is the throttle body and mass airmeter. Another point is that GM spend alot more money than the intake manufacturer on drivability testing under all realworld road conditions and load conditions. i doubt the dyno used is as complex as that used on F1 cars that can vary load dynamically at differing throttle positions. Without going into the math and calculation of maximum airflow and airlow velocity the logic that minimal resistance leads to maximal acceleration is wrong. Basically as the engine revs build if airflow is too slow the motor must suck air into the cyclinder. When the intake is slightly more "restictive" the inertia of the airmoving through the intake fills the cylinder a matched rate. This was explained to me by a BMW engineer. The same hold true with exhaust. I once had a race car that lost @10% of its power on dyno when we shortened the tailpipe. restoreing the length returned the power. Lookat old honda F1 car pics and the oddly long exhaust. The tuning of the intake and exhaust are more important than decreasing diameters and peak WOT wide open throttle numbers are not as important as the area under the curves ie peaky curves yield slower accelleration than slightly lower power figures but wide flat curves. Hope this helps