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Got fmf questions

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Got a 2000 XR100R dirtbike with stock exhaust. Wondering if I get a new FMF powercore 4 will I need to reject it? And anyone know how loud these are and if they sound good on my bike? Thanks all replies appreciated, Matt

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My XR200 has an FMF powercore pipe and did not need re-jetting. Check the FMF website...I think it will say if the bike needs re-jetting or not.

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i never did an fmf on a xr100 but did pro circuit on a crf230 and fmf on a crf250. both bikes sound great.  not sure if you need to re-jet but to get good power gains you should re-jet. its not hard to do. why not just do it. a jet costs all of $2

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Wondering if I get a new FMF powercore 4 will I need to reject it? 

 

Reject it like it's that Ex that screwed you over a long time ago.

 

Re-jetting it would bring better response and power, in addition to the pipe.

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