first off, pulleys don't give you 40 horespower. You should build up your engine before you get Nitrous. Camshafts, header, exhaust, underdrive pulley, intake, lightened flywheel, racing clutch, etc.racinsentra said:I want to do autocross, but I'm also going to drag with my friends and stuff at the track. And I espically don't have the money to get a turbo or supercharger, and I want some more power. Should I buy nitrous, or I could get new pullys which will give me like 40 more HP. Should I get something like that or are there other things that will give me kindof more power? And if I bought nitrous would that mess up my engine or anything?