FMF Stainless Steel MegaBomb Header

Item Number: 326012


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Product Description

FMF Racing

FMF Stainless Steel MegaBomb Header

  • The science behind the Megabomb header may be FMF's greatest engineering accomplishment to date
  • You can bolt on a Megabomb with an existing FMF Racing slip-on for as much as a 3hp boost
  • Reduces noises levels by as much as 1.5dB
  • The Megabomb's technology produces more low end to mid-range gains as well as broadening out the mid to top end power gains over stock
  • Best used for Motocross/Supercross and GNCC style trails.
  • Next level technology you can have today
  • Produces long header torque and short header over-rev
  • Made from premium American TiMetal material, it's the #1 Header in 2011 Supercross, Motocross, Motocross of Nations and Monster Energy Cup

Spec Details
Configuration Varies (make selection above)
Country of Origin USA
Material Stainless Steel

Vehicle Fitment

Fitment is guaranteed or your money back plus free return shipping. Don't waste time installing a product that doesn't fit. We worked hard ensuring that this product is an exact fit on the vehicles listed below.


  • CRF150R 2007-2009, 2013-2014
  • CRF250R 2006-2013
  • CRF250X 2004-2009, 2012-2013
  • CRF450R 2004-2012
  • CRF450X 2005-2009, 2012-2014
  • TRX450R Sportrax 450R 2006-2014


  • TC 449 2011-2013


  • 250 SX-F 2009-2012
  • 250 XC-F 2009, 2011
  • 250 XCF-W 2009-2010, 2012-2013
  • 350 SX-F 2011-2012
  • 350 XC-F 2011-2012
  • 350 XCF-W 2012-2014
  • 450 SX-F 2007-2012
  • 450 XC-F 2009
  • 450 XC-W 2012-2014
  • 500 EXC 2012-2016
  • 505 SX-F 2008
  • 505 XC-F 2008-2009


  • KLX250S 2006, 2009-2014
  • KLX250SF 2009-2010
  • KX250F 2009-2014
  • KX450F 2009-2014


  • LT-R450 QuadRacer 450 2006-2010
  • RM-Z250 2007-2012
  • RM-Z450 2008-2014


  • WR250F 2001-2013
  • WR250R 2008-2014
  • WR250X 2008-2011
  • WR450F 2003-2014
  • YFZ450 2004-2009, 2012-2013
  • YFZ450R 2009-2014
  • YFZ450X 2010-2011
  • YZ250F 4-Stroke 2001-2013
  • YZ450F 2003-2013

Customer Reviews

Questions & Answers

  • Will this header fit over my fmf powercore 4

    By: Pierce

    FMF's MegaBomb headers are indeed designed to work with FMF mufflers. One thing that's important to know, however, is that some of those mufflers may come with an adapter sleeve so you can configure it to fit the stock, or FMF header. Usually, there's only one sleeve included with the muffler to have it fit the OEM header, but sometimes there's another sleeve that's included for fitting that muffler to the FMF header. So long as you have all of the original hardware that came with your PowerCore 4, you should have no problem installing this FMF MegaBomb header on your machine.

    By: Staff

  • Will it fit a hmf exhaust

    By: Guest

    FMF headers will only fit machines equipped with a stock or an FMF muffler. This is due to the fact that most FMF headers have an outlet with a different diameter than the stock muffler on your bike. To avoid problems with users who fits buy an FMF muffler, and then later add an FMF MegaBomb header, for example - the manufacturer includes an adapter to fit the FMF muffler to the stock head pipe. When you add an FMF header, you simply do not use the adapter sleeve and the FMF muffler will slip straight over the FMF header for a flawless, leak-free fit.

    By: Staff