What are your mods - I have heard the same thing about C&L's but I love mine - I noticed a seat of the pants improvement as soon as it was installed - on a normally aspirated ride it will make a bit more power. All I have done is a E303, 1.7's, 70mm t/b, 76mm C&L, 19lbs, AFPR set to 42lbs, 14.5* timing, Edelbrock Performer, CAI inside fender, Crane Fireball, Plasma Booster (multi spark unit), pullies, elec. fan, mild exhaust port work on E7's, MAC equal length shorties, high flow cats, Flowmasters, 2.5 pipes, rebuilt 5spd, 3.73's, etc... I have some 24#'s and 24# tube ready to install and am wondering if it will make any more power or if it will make it run rich - I hear best economy/power balance is at 14.7 A/F ratio that the computer tries to maintain that based on O2 sensors signal and that the computer will cut out pulse width on 24#'s to compensate and that the C&L is allowing more air into the system "fooling" the computer and making it run a bit lean thereby giving more seat of the pants power. I get so confused too - I hope somebody else knows