I needed something that will perform @ 7500 rpm......Since the friggin MSD DIS4 thing kept failing every 6 months I decided to give the Buick GN ignition system a chance....I've heard a couple of guys with my year stang using this set-up, and they swear by it.....I have to change the spark plug boots the 90 degree types, and do some splicing...Hopefully everything will work....DA snake boy!!!!