I agree with that to an extent. There are some modifications that I have personally done that have made a big gain in my driving experience. Examples would be, Intake, Exhaust, Springs. Now here is the kicker, I created a home made ram air for my 94 PGT and it had more pull than when I took it off, and put on a $200 PRM intake.
So just because it is expensive, does not mean it is better.
Like I said earlier about the stock pully, often, stock parts are the way you should keep it.
Nothing wrong with wanting to tinker with your car, but if you really want power and good handling, buy it that way stock. :driving: