Being SS has no bearing on sound.It just depends on the muffler type.I have Summits 3 inch SS on the 65.Exits in front of the wheels.Just has a deep throaty sound.Been on for 8 years and still look great.If I went all the way out back it would be quieter.I believe you can run 2 1/2 out the back with springs moved in.3 inch I dont believe will fit unless the tank is narrowed.Rocky