Wazzup bro! Check out my mods on my AT p5. SR motorsports cams, custom cold air intake, UR underdrive pulley, SR water pump and alternator pulley, Ractive 4 to 1 race header with 2.25 exhaust ( no converters) and hyperground kit. I love the way N/A sounds. I have other mods too but this is on my motor only. So far, so good. No problems and it's way faster than stock, very happy with set up. Once I teak air/fuel, I know I'll be the quickest A/T P5 in my home town. Try to keep your car as light as possible too. At this modest stage of performance, my car pulls pretty hard. The tranny holds up great, it does need a better torque converter. My buddy Eric has a stock P5(5spd) and was surprised with the torque and throttle response of my modded p5. I choose wisely about the cars I race and this helps me have a better race record. I hope I helped you out with my ideas. Good luck with yours.