| John W, I have Ducati Performance cans and airbox mod on mine, sounds awesome, not TOO loud, bit like a 996 on Termi's. When riding the bike you only really hear the air intake anyway, everyone else gets to hear the cans. The 14 tooth gearbox sprocket mod is a must on an ST4S-they are very overgeared as standard. My bike is yellow but then you will have seen that since Jools has posted the photo for me-(thanks Jools).
John |