RE: whats the different between tune muffler and tune pipe?
I once raced my friends Suzy 500x3 against a Triumph 750 in the mid 70-ties. The first mile was for the Suzy loud and clear, but then at top speed I had to reduce throttle due to heat problems, and the Triumph roared by soon enough.
So much for air cooled two strokes against four stroke thumpers.