Hey, I have a '91 Z28 convt. It's got a 305 and a 5 speed. So far, all I've done to it is change the color to yellow, and put a high flow cat and flowmaster american thunder cat back exhaust on it. My question is, what should I do next? What's a cheap mod to do that'd be the most noticable? I know the exaust really helped, but what should I do to make it faster?

 

Throw some headers on it. Got any pics of it?