Best first move
I got my 330ci a few months ago and want to put some performance into it now. The engine is completely stock and I'm contemplating either getting ebay headers or an exhaust. I've heard from a few people that headers with a stock exhaust will do nothing for me. What would be the best thing to do with around $500 dollars? Ebay headers are cheap but I'm not sure how much installation will be. Acceleration and horsepower is my main goal. Any help is appreciated. Thanks.