[98SteedaGT]

I agree, would wait on the TB. I put a FRPP 70mm TB on my car after I had Flowmaster 40's, BBK H-Pipe, 1.5in drop, new suspension parts, chip, and Ram Air kit w/KN. I didn't notice much of any difference. I noticed a very slight (and I mean slight) difference in higher RPM's, it seemed to not be starving as much, but at that RPM the factory heads suck anyways, so I would agree with everyone else on the mods. I noticed the most difference in performance when I did the (Exhaust/Chip/RamAir , and then when I did the T/A,MAF,Underdrives) unless you have PI heads, larger injectors, etc... I don't think you are going to see much of a difference in punch. Also, like has been mentioned before, if you make it too large in relation to your MAF and engine, you will see a loss in intake velocity and lose HP..... I read that in several difference articles about this topic