i have the same chip in my 85 325 e adds about 20 hp cons are 92 octain or higher premium unleaded only. and turns up idle speed to around 1000 rpms might not be worth it on a stock car .reason i have it on mine is i have msd ingnition system .and 3" cat with full flowmaster exhast. and so on,if you plan on doing more to your car might buy it and hold on to it for a later date. cant beat 35 bucks.