hey people, just having a look at xforce mufflers, one of my mates can get them fairly cheap... just wondering your thoughts on this muffler: x-force twin tip Will i get any power gains? Any losses? What sort of noise will this sort of muffler make? the body is 5x8 with twin 3" tips... 3" sounds massive.. is that what most people tend to get or smaller? i really dont know anything about mufflers, so please help me out! thanks in advance!