when i bought my trike it had the standard yamaha system on it and i kept tearing it off because of the way it was mounted and eventually i built my own system for $90. i bought two hot dog mufflers and attached them to the header pipes.the exhaust finishes just in front of the diff. it does sound loud but not over the top. my mates say when i turn up that they didnt hear me turn up so i have the best of both worlds, it,s throatie but also quite at the same time.