Does any one have a dyno run on a FMF Gnarly pipe for a 400? Also I have added a TM38, Boyesen reeds, wisco piston, modified air box. I am still running the stock silencer. Any one know how much HP I could have? What RPM should I set the clutch? Thanks:
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im guessing you have about around 10 more hp then a stock one






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I know the one I had split wide open twice. After the second welding, it was tossed.

 

ha, probably a good indication that it insn't that good of a pipe.