My friend says mods are a waste! :(

UNKNOWN_370

Your friend is right. What I did first were my brakes. Now i'm working on suspension mods. You can add just as much acceleration time improving your suspension tune as you can intake/exhaust if done right. The difference is, the suspension tune will be useful throughout the range and will really make your car feel better.
Intake and exhaust are great for aesthetics unless you're doing quarter miles. I prefer the MAF hose mod as it helps keep air cooler going into the intake which has more use. In conjunction with HP filters you get 3-8hp throughout the range, instead of 10-15 hp in the last 200rpm. But if you're on the dragstrip? Thats where you will need high rev power.

N/A applications. The most important things are:
Brakes
Suspension
Cooling
weight reduction.

At the end of the day though... It's your money. Use it how you want to. Opinions are like azzholes.

But $4,000 in breathing mods? (intake, headers, test pipe, exhaust) Or $4,500 in a supercharger? I'll take the supercharger. Or spend an extra grand or two on a single turbo kit.