I was wondering who makes an exhaust kit (that actaully increases hp) for the 500 Scrammy 4x4. Sometihg that won't exceed the trail decibel limit. And where to buy possibly.

 

White Bros. and FMF make good silencers that arent too loud and give a good boost in low to midrange power.I dont think you will find a pie of any kind that gives a huge gain on a 500.For big gains you need to reclutch it to the way that YOU ride.

 

im pretty sure my HSP system is leagal for the trials...i dont know about HPD or RCR tho