moto fmf exhaust

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Gibson265R · #11 Post by **Gibson265R** » Mon Oct 19, 2009 3:23 am

so the silencer isnt the problem...its the header??? I have a HMF with a custom toaster header....never dyno'd it. It runs fine but the dyno tells all.

wistech · #12 Post by **wistech** » Wed Oct 21, 2009 8:12 pm

Id even go as far as to say some of the stock fx400 headpipes would perform better than the HMF's headpipe. I dont really understand why there is such an inconsistancy in the welding setups. Of course these parts are assembled by hand and not robot so human error has a lot to do with it. Just like the collar welds . Some are smooth and tight to the pipe and some are huge tall restrictors that need lots of grinding .