i have an 09 m1k and i was set on doing the slp exhaust with a box. then i found the tunnel dump muffler which seems like a better idea since there would be no exhaust cap off. Obviously there is a hp gain with doing the full exhaust and a box compared to the can but if you have more un useable hp compared to less usable hp.... seems like the second option would be better. Plus, if i just did the tunnel dump can, no need to spend the coin on a box. I know everyones first response is the do a y pipe and a pipe WITH the tunnel dump can but i just am not willing to dump that amoutn of coin at this time. So, in everyone's experience on this site, full exhaust with a box and have the extra hp and risk bogging or do the tunnel dump can and use the other money for other goodies?
Vernon
Vernon