FMF Factory 4.1 RCT Aluminum Slip-On w/ Stainless Mid Pipe

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Rating 4.76 of 5 (5 Reviews)

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Product Information

FMF Factory 4.1 RCT Aluminum Slip-On w/ Stainless Mid Pipe

The exhaust pipe of JGR Yamaha, Lucas Oil Troy Lee KTM and Rockstar Husqvarna, the FMF Factory 4.1 RCT Slip-On is not only a motocross and supercross race winner on the pro level but also a super easy mod that boosts the power and appearance of your bike. Extremely trick looking with the carbon fiber end cap, the Factory 4.1 features FMF’s unique Resonance Chamber Technology that provides power increases across the RPM range while staying AMA noise level compliant. For the racer, the Factory 4.1 is a must have addition to your bike.

Features:
  • All new incorporating the latest in RCT (Resonance Chamber Technology)
  • Patented core shape lowers sound level while maintaining maximum power output
  • Patented canister shape increases internal volume for more sound absorbing material
  • Patented chamber design to enhance and refine exhaust pressure
  • Factory Forward Engineering centralizes mass and is less prone to crash damage
  • Tuned exhaust with optimized core specifications for each application
  • Innovative rear endcap for simple installation of tuning tip inserts or spark arrestor
  • Stainless steel midpipe for strength and durability



  • Item # 47545
  • SKU #
  • Mfr. Part #

FitmentView All

Honda Models

  • CRF250R : 2011–2017
  • CRF450R : 2011–2016
  • CRF450X : 2005–2009, 2012–2015, 2017

Husqvarna Models

  • FC 250 : 2014–2017
  • FC 350 : 2016–2017
  • FC 450 : 2014–2017
  • FE 250 : 2014–2015, 2017
  • FE 350 : 2015
  • FE 501 : 2014–2015

Kawasaki Models

  • KX250F : 2009–2017
  • KX250F Monster Energy : 2009
  • KX450F : 2009–2017
  • KX450F Monster Energy : 2009

KTM Models

  • 250 SX-F : 2009–2017
  • 250 SX-F Factory Edition : 2015
  • 250 XC-F : 2009, 2011–2016
  • 250 XCF-W : 2009–2010, 2012–2016
  • 350 EXC-F : 2012–2015
  • 350 SX-F : 2011–2016
  • 350 XC-F : 2011–2016
  • 350 XCF-W : 2012–2016
  • 450 SX-F : 2009–2017
  • 450 SX-F Factory Edition : 2015
  • 450 XC-F : 2009, 2013–2016
  • 450 XC-W : 2015–2016
  • 500 EXC : 2012–2015
  • 500 XC-W : 2015–2016

Suzuki Models

  • RM-Z250 : 2010–2017
  • RM-Z450 : 2011–2017

Yamaha Models

  • WR250F : 2015–2016
  • WR450F : 2016
  • YZ250F : 2010–2017
  • YZ250F Anniv. : 2016
  • YZ250FX : 2015–2016
  • YZ450F : 2010–2017
  • YZ450F Anniv. : 2016
  • YZ450FX : 2016

Product Reviews 1 - 5 of 5

Overall Rating: 4.76 of 5

(5 Reviews)
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What Other Riders Are Saying...

Fit

Quality

Sound

Install

Performance

Lots of low end

The product sounds amazing on my 2016 yamaha wr250f. The tip was cracked when it was shipped and the factory exhaust clamp does not fit! Also you are going to need to buy a tuner if your bike is fuel injected because it barely runs unless you are almost wide open throttle.

Jess - June 14, 2016

(Springview, NE)

Fit

Quality

Sound

Install

Performance

Nice

I love it, sounds amazing.

Vladimir - March 30, 2015

(Brooklyn, NY)

Fit

Quality

Sound

Install

Performance

Excellent

The best exhaust that I could have bought, awesome sound and performance.

Alejandro - March 26, 2014

(Miami , FL)

Fit

Quality

Sound

Install

Performance

Major torque increase on KTM 450

This pipe absolutely cures the common complaint about the new 450SXF's lacking on bottom end torque. 3rd gear wheelies out of hairpin corners are common now even without a clutch kick. Once you take your stock muffler off, try looking through it and you'll see why the bike is so choked up.

Brad W - December 5, 2013

(Laveen, AZ)

Fit

Quality

Sound

Install

Performance

awesome

Great company and product.

larissa m - February 14, 2013

(scranton, PA)