Well, what can I add.... RevsTo9K, u seem to look down on people that are not planning to do the turbo mod. The fact is that it is not that cheap. The Turbo kit will cost at least 3500. To that add the clutch because it wont hold higher than 4 psi before slipping. Even if u run at 8 psi, the drivetrain cant take it. The car has so much power that it's uncontrollable. The differential slips all the time. You need to change that to. And that is very expensive. U're still looking at over 5000.
Im not saying that those are bad ideas. Hey, if I had the $, I'd probably do it but then again, if I had the $, I probably would of bought something else.
As far a giving definite numbers to gains, I have difficulty buying into that. A cat back will bring genrally around 8% increase. Cuz like the majority agrees, the Hp gains varies will the original engine power. With headders, u can look at maybe 12%. U can't just add 5hp for the CAI, and 15 for the exhaust so that's a 20 Hp total ... it's not cumulative.
But, 800$ (CAI, headders+cat-back) sure beats 5000$ and in the end, the guy spending is money will surely be satisfied. Having a house and a kid to raise, I'll be sure to buy him clothes before modding my ride with a turbo. It's just a matter of priorities. Dont trash the others because u dont agree.