'01 426 -- FMF Power Core IV & stock header

5 replies to this topic
  • RandAybarra

Posted February 23, 2014 - 04:07 PM


2001 YZ426-- Anyone know if an FMF Power Core IV exhaust will fit onto the stock header? I've done some sleuthing but can't seem to find an answer.


  • tang426

Posted February 23, 2014 - 04:43 PM


Yes I have one if you need. Too loud for me

  • RandAybarra

Posted February 23, 2014 - 09:06 PM


Thanks. I ordered one from eBay yesterday. If I have any trouble with it, I may take you up on yours.

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  • redogg323

Posted February 26, 2014 - 04:45 PM


How is the power difference?

  • tang426

Posted February 26, 2014 - 05:08 PM


Need to rejet for sure. Seemed to flame out a lot more I woods ride so I really didn't notice any power increase. Noise increase yes. I would like to try a q4

  • redogg323

Posted February 27, 2014 - 04:32 AM


I Am getting into mx and I have been told stay stock

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