Exhaust > FMF Exhaust Systems

EXHAUST SYSTEMS AND SLIP-ON MUFFLERS

FMF logo

Features

  • Complete systems and slip-on mufflers
  • Systems feature titanium PowerBomb header and midpipe, except where noted
  • Factory 4.1 muffler available in natural titanium or blue anodized titanium with titanium end caps
  • Factory 4.1C muffler constructed from carbon fiber with titanium end caps
  • The lightest mufflers and full systems available
  • Superior power and performance – horsepower improved throughout the rpm range
  • Features exclusive proprietary Chamber Core and PowerBomb technology
  • Factory forward engineering centralizes mass, improves handling
  • Ti or carbon muffler with titanium end caps, mid-pipe and PowerBomb header
  • Made from premium quality American materials
  • Customize with performance tuning inserts and spark arrestor module
  • Meets AMA sound requirements on most models; inserts available for others
  • Incredible horsepower gains with 99 dB sound level
  • Titanium construction with American TIMETAL® canister and rear end cap
  • Designed with FMF’s exclusive Factory Forward Engineering – lowering the center of gravity and centralizing mass
  • Utilizes advanced multistage packing material and a Hi-Flo stainless steel formed front end cap and mid-pipe
  • Removable spark arrestor included and optional 96 dB insert available separately;
  • Offers an increase of power that starts from the low end of the rpm scale and continues on through the mid with a huge increase in top-end rpm power
  • Constructed from military-grade titanium – the lightest and strongest metal on the planet
  • Substantial power gains over standard systems
  • Space-age internal packing for maximum packing life
  • The Q series features advanced engineering to precisely locate baffles and chambers to absorb sound
  • Less mass to enhance power-to-weight ratio
  • Quiet power with minimal sacrifice for performance
  • Developed over years of championship off-road racing
  • Twin-stage core design for lower sound output and extended life of packing material
  • Comes standard with spark arrestor
  • High performance
  • Quiet technology
  • Weighs 10% less than the original Q
  • Consistently meters below 96 dB
  • Maintenance-free U.S.F.S.-approved spark arrestor
  • Fits stock and PowerBomb header
  • Developed over years of championship off-road racing
  • Max sound output 96 dB; most models below 94 dB
  • American TIMETAL® canister, end caps and mid-pipe
  • Comes standard with spark arrestor
  • Advanced sound-deadening baffles and chambers, an internal spark arrestor and durable packing material
  • Computer designed and dyno tested for each 4-stroke application
  • Fits stock and PowerBomb header
  • New modular end cap allows easy tuning alterations
  • Standard Hi-Flo 2” end cap boosts all-around performance; optional smaller 13/4” end cap smooths power delivery; spark arrestor module adds off-road versatility
  • Computer designed and dyno tested for every 4-stroke application
  • Enhanced sonic evacuation delivers a higher flow of exhaust gases which increases power
  • A stainless steel mid-pipe mates to the computer-designed rear can for lightweight durability
  • Square or round (depending on the machine) perforated steel inner cores make for optimum flow, using hi-flo technology
  • FMF’s exclusive cross-weave internal packing provides longevity and maximum sound dispersion
  • Elliptical aluminum can offers strategic sizing for superior performance
  • Optional Quiet Core insert will provide a decrease in sound level if desired
  • PowerCore 4 SA system features a patented screen-type spark arrestor that is approved by the U.S.F.S. and does not interrupt exhaust flow so there’s no performance loss
  • The PowerCore 4 SA system’s strategic ports allow the sonics to evacuate more effectively with the computer-designed Performance Flow end cap
  • Finally, the PowerCore 4 SA system is the new power standard via square inner-core technology; big weight savings over stock
  • Combines the huge weight savings of titanium with the performance traits gleaned from FMF’s association with factory motocross teams
  • Thousands of hours of both track and dyno time have resulted in power gains averaging just under 20%
  • Made from military grade titanium that is light and durable – in most cases the Ti 4 is 50% lighter than stock

Images

EXHAUST SYSTEMS AND SLIP-ON MUFFLERS

FACTORY 4.1™/ FACTORY 4.1C™

  • FACTORY 4.1™/ FACTORY 4.1C™
  • TITANIUM POWERCORE
  • TI 4 SLIP-ON MUFFLER
  • Q4
  • Q2
  • POWERCORE 4 AND POWERCORE 4 SA
  • FACTORY 4™ MUFFLERS


CRF50R 04-08/XR50 00-03

Part # Description Retail
FMF040072  PowerCore 4 slip-on muffler w/ header   $179.95 
FMFH415  PowerCore 4 spark arrestor muffler w/ header   $199.95 
1820-0039  PowerCore 4 Big Bore w/ header   $179.95 
1820-0593  Mini Factory 4.1C system, w/ titanium header   $439.95 
1820-0592  Anodized Mini Factory 4.1 system w/ titanium header   $399.95 
1820-0498  Mini Factory 4.1 system w/ titanium header   $399.95 
1820-0497  Mini Factory 4.1 system w/ stainless steel header   $299.95 

CRF70F 04/XR70R 01-03

Part # Description Retail
FMF041017  PowerCore 4 spark arrestor muffler w/ header   $199.95 
FMF041016  PowerCore 4 slip-on muffler w/ header   $179.95 

CRF70F 05-08

Part # Description Retail
1820-0252  PowerCore 4 slip-on muffler w/ header   $179.95 
1820-0253  PowerCore 4 spark arrestor muffler w/ header   $199.95 

XR80 86-90/93-00

Part # Description Retail
FMF040083  PowerCore 4 slip-on muffler w/ header   $179.95 
FMF040084  PowerCore 4 spark arrestor muffler w/ header   $199.95 

XR80R/CRF80F 01-08

Part # Description Retail
FMF041015  PowerCore 4 spark arrestor muffler w/ header   $199.95 
FMF041014  PowerCore 4 slip-on muffler w/ header   $179.95 

XR100R 86-00

Part # Description Retail
FMF040083  PowerCore 4 slip-on muffler w/ header   $179.95 
FMF040084  PowerCore 4 spark arrestor muffler w/ header   $199.95 

XR100R/CRF100F 01-08

Part # Description Retail
FMF041015  PowerCore 4 spark arrestor muffler w/ header   $199.95 
FMF041014  PowerCore 4 slip-on muffler w/ header   $179.95 

CRF150F 03-08

Part # Description Retail
FMF041048  PowerCore 4 spark arrestor muffler   $299.95 
FMF041068  Q spark arrestor muffler   $289.95 

CRF150R 07

Part # Description Retail
1820-0509  Factory 4.1 system, w/ PowerBomb header   $749.95 
1820-0594  Factory 4.1 system w/ MegaBomb header   $799.95 
1820-0510  Factory 4.1 system w/ PowerBomb header, anodized   $749.95 
1820-0595  Factory 4.1 system w/ MegaBomb header, anodized   $799.95 
1820-0511  Factory 4.1C (carbon fiber) system w/ PowerBomb header   $849.95 
1820-0596  Factory 4.1C (carbon fiber) system w/ MegaBomb header   $899.95 
1821-0544  Factory 4.1 slip-on muffler, stainless steel   $399.95 
1821-0546  Factory 4.1 slip-on muffler, titanium   $449.95 
1821-0545  Factory 4.1 slip-on muffler, anodized stainless steel   $399.95 
1821-0547  Factory 4.1 slip-on muffler, anodized titanium   $449.95 
1821-0548  Factory 4.1C (carbon fiber) slip-on muffler   $549.95 
1821-0540  PowerCore 4 slip-on muffler   $299.95 
1821-0541  Ti PowerCore slip-on muffler   $349.95 
1821-0542  Ti PowerCore slip-on muffler, anodized   $349.95 
1821-0543  Q4 spark arrestor muffler   $349.95 

XR200R 86-02

Part # Description Retail
FMF-H406  PowerCore 4 spark arrestor muffler   $249.95 

CRF230F 03-08

Part # Description Retail
FMF041048  PowerCore 4 spark arrestor muffler   $299.95 
FMF041068  Q spark arrestor muffler   $289.95 

CRF250R 04-05

Part # Description Retail
1820-0228  Factory 4.1C (carbon fiber) system w/ PowerBomb header   $899.95 
1820-0226  Factory 4.1 system w/ PowerBomb header   $799.95 
1820-0227  Factory 4.1 system w/ PowerBomb header, anodized   $799.95 
1821-0249  Factory 4.1 slip-on muffler, stainless steel   $424.95 
1821-0250  Factory 4.1 slip-on muffler, anodized stainless steel   $424.95 
1821-0251  Factory 4.1 slip-on muffler, titanium   $499.95 
1821-0252  Factory 4.1 slip-on muffler, anodized titanium   $499.95 
1821-0305  Factory 4.1C (carbon fiber) slip-on muffler   $599.95 
1821-0662  PowerCore 4 slip-on muffler   $299.95 
1821-0393  Ti PowerCore slip-on muffler   $349.95 
1821-0395  Ti PowerCore slip-on muffler, anodized   $349.95 
1821-0653  Q4 spark arrestor muffler   $359.95 
1821-0654  Q4 Ti spark arrestor muffler   $399.95 

CRF250R 06-08

Part # Description Retail
1820-0324  Factory 4.1 system w/ PowerBomb header   $799.95 
1820-0597  Factory 4.1 system w/ MegaBomb header   $849.95 
1820-0327  Factory 4.1 Dual system w/ PowerBomb header   $999.95 
1820-0418  Factory 4.1 Dual system w/ MegaBomb header   $1,099.95 
1820-0325  Factory 4.1 system w/ PowerBomb header, anodized   $799.95 
1820-0598  Factory 4.1 system w/ MegaBomb header, anodized   $849.95 
1820-0328  Factory 4.1 Dual system w/ PowerBomb header, anodized   $999.95 
1820-0419  Factory 4.1 Dual system w/ MegaBomb header, anodized   $1,099.95 
1820-0326  Factory 4.1C (carbon fiber) system w/ PowerBomb header   $899.95 
1820-0599  Factory 4.1C (carbon fiber) system w/ MegaBomb header   $949.95 
1820-0329  Factory 4.1C (carbon fiber) Dual system w/PowerBomb header   $1,099.95 
1820-0472  Factory 4.1C (carbon fiber) Dual system w/ MegaBomb header   $1,199.95 
1821-0392  Factory 4.1C (carbon fiber) slip-on muffler   $599.95 
1821-0403  Factory 4.1 slip-on muffler, titanium   $499.95 
1821-0397  Factory 4.1 Dual slip-on muffler set   $399.95 
1821-0391  Factory 4.1 slip-on muffler, anodized titanium   $499.95 
1821-0398  Factory 4.1 slip-on muffler, dual anodized titanium   $399.95 
1821-0663  PowerCore 4 slip-on muffler   $299.95 
1821-0401  Ti PowerCore slip-on muffler   $349.95 
1821-0402  Ti PowerCore slip-on muffler, anodized   $349.95 
1821-0655  Q4 spark arrestor muffler   $359.95 
1821-0656  Q4 Ti spark arrestor muffler   $399.95 

CRF250X 04-07

Part # Description Retail
1821-0249  Factory 4.1 slip-on muffler, stainless steel   $424.95 
1821-0250  Factory 4.1 slip-on muffler, anodized stainless steel   $424.95 
1821-0251  Factory 4.1 slip-on muffler, titanium   $499.95 
1821-0252  Factory 4.1 slip-on muffler, anodized titanium   $499.95 
1821-0305  Factory 4.1C (carbon fiber) slip-on muffler   $599.95 
1821-0662  PowerCore 4 slip-on muffler   $299.95 
1821-0393  Ti PowerCore slip-on muffler   $349.95 
1821-0395  Ti PowerCore slip-on muffler, anodized   $349.95 
1821-0653  Q4 spark arrestor muffler   $359.95 
1821-0654  Q4 Ti spark arrestor muffler   $399.95 

XR250R 96-04

Part # Description Retail
FMF041020  PowerCore 4 spark arrestor modular muffler   $269.95 
1821-0448  Q2 spark arrestor muffler   $359.95 

XR400R 96-04

Part # Description Retail
1821-0449  Q2 spark arrestor muffler   $359.95 
FMF041021  PowerCore 4 spark arrestor modular muffler   $299.95 
FMF040145  Ti 4 slip-on muffler   $249.95 

CRF450R 02

Part # Description Retail
FMF040145  Ti 4 slip-on muffler   $249.95 
FMF041004  PowerCore 4 spark arrestor modular muffler   $299.95 
1821-0245  Q2 spark arrestor muffler   $359.95 

CRF450R 03

Part # Description Retail
FMF040145  Ti 4 slip-on muffler   $249.95 
FMF041036  PowerCore 4 spark arrestor modular muffler   $299.95 
1821-0246  Q2 spark arrestor muffler   $359.95 

CRF450R 04

Part # Description Retail
1820-0229  Factory 4.1 system w/ PowerBomb header   $799.95 
1820-0230  Factory 4.1 system w/ PowerBomb header   $799.95 
1820-0231  Factory 4.1C (carbon fiber) system w/ PowerBomb header   $899.95 
1821-0253  Factory 4.1 slip-on muffler, stainless steel   $424.95 
1821-0254  Factory 4.1 slip-on muffler, anodized stainless steel   $424.95 
1821-0255  Factory 4.1 slip-on muffler, titanium   $499.95 
1821-0256  Factory 4.1 slip-on muffler, anodized titanium   $499.95 
1821-0306  Factory 4.1C (carbon fiber) slip-on muffler   $599.95 
1821-0664  PowerCore 4 slip-on muffler   $299.95 
1821-0504  Ti PowerCore slip-on muffler   $349.95 
1821-0505  Ti PowerCore slip-on muffler, anodized   $349.95 
1821-0657  Q4 spark arrestor muffler   $359.95 
1821-0658  Q4 Ti spark arrestor muffler   $399.95 

CRF450R 05-08

Part # Description Retail
1820-0249  Factory 4.1 system w/ PowerBomb header   $799.95 
1820-0600  Factory 4.1 system w/ MegaBomb header   $849.95 
1820-0250  Factory 4.1 system w/ PowerBomb header, anodized   $799.95 
1820-0601  Factory 4.1 system w/ MegaBomb header, anodized   $849.95 
1820-0251  Factory 4.1C (carbon fiber) system w/ PowerBomb header   $899.95 
1820-0602  Factory 4.1C (carbon fiber) system w/ MegaBomb header   $949.95 
1821-0282  Factory 4.1 slip-on muffler, stainless steel   $424.95 
1821-0283  Factory 4.1 slip-on muffler, anodized stainless steel   $424.95 
1821-0284  Factory 4.1 slip-on muffler, titanium   $499.95 
1821-0285  Factory 4.1 slip-on muffler, anodized titanium   $499.95 
1821-0307  Factory 4.1C (carbon fiber) slip-on muffler   $599.95 
1821-0665  PowerCore 4 slip-on muffler   $299.95 
1821-0394  Ti PowerCore slip-on muffler   $349.95 
1821-0396  Ti PowerCore slip-on muffler, anodized   $349.95 
1821-0659  Q4 spark arrestor muffler   $359.95 
1821-0660  Q4 Ti spark arrestor muffler   $399.95 

CRF450X 05

Part # Description Retail
1821-0282  Factory 4.1 slip-on muffler, stainless steel   $424.95 
1821-0283  Factory 4.1 slip-on muffler, anodized stainless steel   $424.95 
1821-0284  Factory 4.1 slip-on muffler, titanium   $499.95 
1821-0285  Factory 4.1 slip-on muffler, anodized titanium   $499.95 
1821-0307  Factory 4.1C (carbon fiber) slip-on muffler   $599.95 
1821-0665  PowerCore 4 slip-on muffler   $299.95 
1821-0394  Ti PowerCore slip-on muffler   $349.95 
1821-0396  Ti PowerCore slip-on muffler, anodized   $349.95 
1821-0659  Q4 spark arrestor muffler   $359.95 
1821-0660  Q4 Ti spark arrestor muffler   $399.95 

CRF450X 06-07

Part # Description Retail
1821-0744  Factory 4.1 slip-on muffler, stainless steel   $424.95 
1821-0745  Factory 4.1 slip-on muffler, anodized stainless steel   $424.95 
1821-0746  Factory 4.1 slip-on muffler, titanium   $499.95 
1821-0747  Factory 4.1 slip-on muffler, anodized titanium   $499.95 
1821-0739  PowerCore 4 slip-on muffler   $299.95 
1821-0740  Ti PowerCore slip-on muffler   $349.95 
1821-0741  Ti PowerCore slip-on muffler, anodized   $349.95 
1821-0742  Q4 spark arrestor muffler   $359.95 
1821-0743  Q4 Ti spark arrestor muffler   $399.95 

XR600R 85-87, 91-98/00

Part # Description Retail
FMF040145  Ti 4 slip-on muffler   $249.95 
FMF041022  PowerCore 4 spark arrestor modular muffler   $299.95 
1821-0450  Q2 spark arrestor muffler   $359.95 

XR650L 93-08

Part # Description Retail
1821-0242  Q2 spark arrestor muffler   $359.95 

XR650R 00-07

Part # Description Retail
FMF041023  PowerCore 4 spark arrestor modular muffler   $299.95 
FMF040145  Ti 4 slip-on muffler   $249.95 
1821-0243  Q2 spark arrestor muffler   $359.95 

Descriptions and notes

FOR HONDA 4-STROKES

FMF040145: To be used with FMF mid-pipe.

This item appears on page 494 of the OffRoad Catalog