Its just about time to start upgrading my ignition system but I have a few reservations. First, before I got my stang my buddy had a 90' notch that he had put a MSD Blaster coil 2 into. One of the side effects was that he was getting feedback through his stereo system, It would rev up and down with the engine. This didnt seem to bother him but I found it annoying. I have a pretty nice system im my car and I really dont think I could handle that feedback. Is this something that happens with all aftermarket coils? If so is there a quick fix for it? Second, which order should I start with as far as the ignition system is concerned? Finally is it even worth it with a stock fuel system?