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FMF Factory 4.1 RCT Complete Exhaust With Stainless Megabomb Header - Dual

Retail: $974.99
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FMF Factory 4.1 RCT Complete Exhaust With Stainless Megabomb Header - Dual

Product Description

The FMF Aluminum Factory 4.1 RCT Complete Dual Exhaust With Stainless Steel MegaBomb Header And Carbon Fiber End Caps includes the following:

FMF Factory 4.1 RCT Complete Dual Exhaust:

The Factory 4.1 RCT incorporates the latest in FMF Resonance Chamber Technology™ both internally and externally. It starts at the center with a new core - a patent pending shape enhances and refines the exhaust pressure wave for optimal power output while lowering the sound level. In addition, it achieves a shorter overall length that is less susceptible to crash damage and complementary to the Factory Forward Engineering - moving the muffler(s) closer to the motor to centralize mass. Visible changes to the exterior include a redesigned canister to increase internal capacity for the maximum volume of packing material. The packing itself was not overlooked - a proprietary blend formulated for superior durability and sound attenuation. The final component is a new rear endcap engineered for simple tuning adjustments incorporating a snap ring feature to secure the standard and optional inserts. The Factory 4.1 RCT is constructed from only aerospace-grade materials that meet FMF's exacting specifications and 100% manufactured at their Southern California factory.

  • Massive Power gains throughout the RPM range.
  • Quieter than stock.
  • Huge weight savings.
  • New RTS (Rapid Tuning System) makes for easy sound insert changes as well as adding U.S. Forestry Approved Spark Arrestor.
  • #1 Exhaust in 2011 Supercross Series, 2011 Motocross Series, 2011 Motocross of Nations and 2011 Monster Energy Cup!

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 for as much as a 3 horsepower boost, plus the MegaBomb actually reduces noise levels by as much as 1.5dB. Used by Factory Teams, the MegaBomb is the next level technology you can have today.

  • Produces long header torque and short header over-rev.
  • Reduces sound output as much as 1.5dB.
  • Increases output from stock motor as much as 3 HP, alone.

Detailed Specifications:

  • Configuration: Dual.
  • Construction: Aluminum.
  • Finish: Natural.
  • Midpipe: Stainless steel.
  • Endcap: Carbon fiber.
  • Spark arrestor: Screen insert (included).
  • Quiet insert: 94dB insert (included).
  • Header construction: Stainless steel.
  • Header type: MegaBomb.

Note: For closed course competition use only. Not intended for street use.

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Overall
Great exhaust system!

This exhaust was the missing link on my 2013 CRF 450R. It made it more snappier and helped the bike pull better instead of flattening out. When I rode with it for the first time I knew immediatley my bike responded better.

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Philip Over 10 months ago Location: Sachse, TX, USA
What is the db measured at without the quiet insert? is it difficult to remove?
MotoSport Staff
Over 10 months ago Location: Portland, OR, USA
This will be a 98 dB system without the quit core installed and a 94 dB system with it installed. The quite cores are held in with one bolt on the bottom of the exhaust tip. Very quick and easy installation and removal.
yz250 1 year ago
How easy is it to remove the spark arrester? Do I need to drill out rivets or is it as easy as unscrewing a screw?
MotoSport Staff
1 year ago Location: Portland, OR, USA
There will be no drilling required to remove the spark arrestor screens. A single screw is all that holds them in.
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