So , what's the theory behind silencers ? If I compare the standard PC 304 unit on my 2007 KX250 to the PC R-304 race unit , the R-304 is much shorter . So , logically , I would assume that less core size would mean less back pressure and potentially greater flow at high rpm . Right ?
If that's the case , why do most people say that the shorter silencer is stronger in the mid rpm range ? In theory , does this mean that it is actually weaker at higher rpm compared to the longer silencer ?
I hate to sound stunned , but , I am new to 2 strokes and I want to make sense of this as best as I can . If the shorter silencer makes more power , why isn't everyone using it ? In my experiment , the shorter silencer was stronger in the mid range for sure . But , I've only done very limited testing so far under one basic riding condition ( service road ) .