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802wrRider

'03 wr450 fmf 4.1 question?

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i've done some reading and some searching and from what i read the fmf 4.1 pipe with the quiet insert is the pipe to get over the Q4. my question is, why is this and how loud is the 4.1 or powercore with the quiet core insert as apposed to say a stock pipe with a PMB insert?

Trevor~

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