Hello,

SPA rules regarding mufflers:
A proper muffler must be used but tuned pipes are not legal d. Pumps may be used but no oversized carburetors can be used.


What category would tuned mufflers (like Jett, Evolution new blue muffler, and the like) fall into?? Are they legal or not??

I ask because I initially assumed they were not allowed due to the fact that they do increase performance. Then I read where a guy won a SPA contest using one of the new Evolution blue mufflers on his new 60NX.

What do u think??