i have an smb/sp motorsport. pricey but i think its well worth every cent.
there are other jap ones e.g. integral kob, autoexe, fujitsubo, 5zigen, RS R.
then you have magnaflow, racing beat, x force, n power.
or instead of branded ones you can just go to your local exhaust shop and they will knock one up for you, custom made.
all of them street legal. but the RSR may attract a few police
