[Richard]

If you love the Flowmaster sound use the 70 series. Same sound but about 50% quieter. Have single 3" on my 94 and get compliments often. They are a bit longer than the others. On any muffler regardless of design, larger usually means quieter. Probably going use two 3" 70 series with an X-pipe on my LSA installed in the 72. HP loss or gain is not a concern for me. Even at 650 or so at the crank, type of muffler would maybe account for 10hp 1 way or the other. Probably no change at all because motor has a supercharger.