FMF PowerCore 4 Slip-On Exhaust

Item Number: 327500

5 stars 1 Review

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Product Description

FMF Racing

FMF PowerCore 4 Slip-On Exhaust

  • When designing the PowerCore 4, FMF looked at their top of the line products to deliver race-inspired performance at an economical price
  • Rugged durability at a price that won't break the bank
  • Overall increase in horsepower and torque
  • Durable stainless steel and Aluminum construction
  • Advanced packing material for maximum longevity
  • Champagne color anodized can

Spec Details
Configuration Varies (make selection above)
Country of Origin USA
Mid-Pipe Stainless Steel
Muffler End Cap Stainless Steel
Muffler Sleeve Champagne Anodized Aluminum
Spark Arrestor Varies (make selection above)

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.


  • DS650 2001-2005


  • DS250 2007-2008
  • DS450 2008-2011


  • CRF150F 2003-2017
  • CRF150R 2007-2009, 2013-2015
  • CRF230F 2003-2009, 2012-2017
  • CRF230L 2008-2009
  • CRF230M 2009
  • CRF250R 2004-2010
  • CRF250X 2004-2009, 2013
  • CRF450R 2002-2010
  • TRX250EX SporTrax 250 2x4 2001-2008
  • TRX250X Sportrax 250X 2009-2014, 2016-2017
  • TRX400EX FourTrax 400EX 1999
  • TRX400EX Sportrax 400EX 2000-2008
  • TRX400X Sportrax 400X 2009-2010, 2012-2014
  • TRX700XX 2008-2009
  • XR200R 1986-2002
  • XR250R 1996-2004
  • XR400R 1996-2004
  • XR600R 1985-1987, 1991-1998, 2000
  • XR650L 1993-2009, 2012-2014
  • XR650R 2000-2007


  • FE 390 2010-2011
  • FE 450 2009-2011
  • FE 570 2009-2011
  • FS 570 2010-2011
  • FX 450 2010-2011


  • TC 450 2009
  • TE 449 2011-2012
  • TE 511 2011-2012


  • 250 SX-F 2005-2008
  • 250 XC-F 2007-2008
  • 250 XCF-W 2007-2008
  • 450 MXC-G Racing 2003-2005
  • 450 SX 2006
  • 450 XC 2007
  • 450 XC-W 2007
  • 520 SX Racing 2000-2002
  • 525 EXC-G Racing 2003-2006
  • 525 MXC-G Racing 2003-2005
  • 525 SX 2006
  • 525 SX Racing 2003-2005
  • 525 XC 2007
  • 525 XC-W 2007
  • 690 Enduro 2008
  • 690 SMC 2008-2010


  • KFX400 2003-2006
  • KFX450R 2008-2014
  • KLX125 2003-2006
  • KLX125L 2003-2006
  • KLX250R 1994-1996
  • KLX250S 2006
  • KLX300R 1997-2007
  • KLX400R 2003-2004
  • KLX400SR 2003-2004
  • KLX450R 2008-2009
  • KX250F 2004-2008
  • KX450F 2006-2008


  • Outlaw 90 2007
  • Predator 500 2003-2007


  • DR250 1990-1993
  • DR350S 1990-1998
  • DR650SE 1997-2014
  • DR-Z125 2003-2010, 2012-2013
  • DR-Z125L 2003-2010, 2012-2017
  • DR-Z250 2001-2006
  • DR-Z400 2000-2004
  • DR-Z400S 2000-2014
  • DR-Z400SM 2005-2009, 2012-2014
  • LT-Z400 QuadSport 400 2003-2014
  • RM-Z250 2004-2009
  • RM-Z450 2005-2010


  • TT-R225 1999-2004
  • TT-R230 2005-2014
  • TT-R250 1999-2006
  • TW200 2001-2014
  • TW200 Trailway 1987-2000
  • WR250F 2001-2013
  • WR250R 2008-2014
  • WR250X 2008-2011
  • WR400F 1998-2000
  • WR426F 2001-2002
  • WR450F 2003-2011
  • XT250 2008-2014
  • YFM90R Raptor 90 2009-2013
  • YFM125R Raptor 125R 2011-2013
  • YFM250R Raptor 250 2008-2013
  • YFM350R Raptor 350 2005-2013
  • YFM350X Warrior 1987-2004
  • YFM660R Raptor 660R 2001-2005
  • YFZ450 2004-2009, 2012-2013
  • YFZ450R 2009-2014
  • YFZ450X 2010-2011
  • YZ250F 4-Stroke 2001-2013
  • YZ400F 1998-1999
  • YZ426F 2000-2002
  • YZ450F 2003-2009

Customer Reviews

Excellent sound

out of 5
5 stars

By on November 8, 2016

This slip-on installed with ease and sounds great compared to the stock muffler that came on my bike.

5 stars
5 stars

Questions & Answers

  • Do I need to purchase any other part if I buy this exhaust for my bike?

    By: jim

    No, there's no need to buy any additional parts in order to fit this exhaust on your machine. Every FMF slip-on muffler includes an adapter to fit to the OEM exhaust or, it'll bolt straight up to any FMF header.

    By: Staff

  • Will this exhaust deliver low end throttle response on a 2013 Yamaha XT-250 with factory fuel injection.

    By: Ben Napier

    FMF's PowerCore 4 Slip-on will increase power slightly through the entire range. This pipe is designed as a freer flowing system compared to stock, which promotes more wide open throttle power versus bottom end torque. The best way to achieve more low end torque would be in a new sprocket gearing. On your bike, stock gearing is 15-48 for US models. If you were to go up teeth in the rear, the next size we have is 55 teeth, this will greatly increase your bottom end torque, and make the motorcycle more dirt oriented vs the street gearing it comes with.

    By: Staff

  • Will I need to rejet the carburetor on my 2009 Honda CRf230L after installing this slip on?

    By: Liam

    While you can most likely get away with installing this exhaust without modifying your bike's fueling, it's always best to adjust the jetting any time you change the CRF230L exhaust, intake - or any other part of the bike that has an effect on the way air gets in or out of the engine. To that end, we have the perfect jet kit to go along with your CRF230L, check out the Moose Carburetor Jet Kit. With that, you'll have all of the components required to get the best possible engine output and throttle response.

    By: Staff

  • Does this exhaust pipe come with high temp silicone

    By: Austdog31

    Typically, FMF mufflers and exhausts relay on thermal expansion at each slip-fit joint to prevent exhaust gases from leaking out of the system. Often, depending on what machine it is that you have - a gasket is included to fit the muffler to the stock header thereby preventing any leakage.

    By: Staff

  • Does this exhaust fit a crf150f 2004?

    By: Jake

    If you have a 2004 model year Honda CRF150F with an OEM or FMF header on it, you should have no problem fitting this slip-on muffler to your machine.

    Simply choose your make, year and model from the drop down menu that's to the right of the main picture and we'll get the correct muffler on its way to you.

    By: Staff

  • is it loud

    By: justin

    If you were to remove the included USFS-approved spark arrestor, in most cases, the exhaust would be louder than the stock exhaust on your machine. If you were to use that same spark arrestor, the exhaust would be within USFS guidelines for use on federal lands and its loudness would be similar to that of a stock machine that comes with a spark arrestor already installed in the exhaust from the factory. There's also a 96 dB FMF exhaust quiet insert that you may purchase if you wish to run the exhaust as free-flowing as possible at tracks where sound is a concern.

    By: Staff

  • Will a crf150r fmf powerbomb header fit on a 2007 crf150f?

    I want a full fmf exhaust for my 2007 crf150f but fmf doesn't make a full exhaust package for the bike, but they do for crf150r.

    By: Moped918

    The CRF150R and CRF150F headers are not interchangeable, so swapping them around will not work for your particular needs. We do have a full exhaust system for your bike in the form of the Pro Circuit T-4 Full Exhaust System. With that, however, you won't be able to fit your FMF muffler to the Pro Circuit exhaust's header pipe. Still, as it does have a USFS-approved spark arrestor in the muffler, you'll be able to ride the bike on public trails.

    By: Staff

  • will this pipe fit on my 2017 trx250x

    By: Chris

    Yes, the FMF PowerCore 4 slip-on muffler will fit the 2017 Honda TRX250X.

    By: Staff

  • so i can buy this exhaust and just slip it on a stock crf 150 2009 trail bike

    By: sam

    That's correct - all FMF PowerCore 4 slip-on mufflers for the Honda CRF150F are designed to fit onto the stock header for that bike. Just choose your particular model from our drop down fit guide that's immediately to the right of the main image on our website and we'll get to proper muffler on its way to you, fast!

    By: Staff

  • this exhaust will fit a 08 xr650l without any mounting issues

    By: BONES

    So long as you have the original header, or an FMF header on the machine you select from our fit guide, you won't have any problems bolting this, or any other FMF muffler we sell onto your machine. In just about every case, there's no permanent modifications required to complete the job. Just pull the stock muffler off your bike, bolt the FMF unit on and you're ready to ride!

    FMF slip-on mufflers are designed to fit machines with the stock, or an FMF header on them. Each muffler comes with the appropriate slip joint to work in both cases.

    By: Staff

  • Will this Fit a 2005 KLX125L?

    By: Guest

    Yes, we do have an FMF PowerCore 4 slip-on exhaust that will fit the 2005 Kawasaki KX125L.

    Simply choose your machine from our fit guide to get the proper muffler for the KX125L.

    By: Staff

  • Will this fit on my 2002 trx400ex? Will this make it louder?

    By: Hooter

    Yes, absolutely - simply choose the 2002 Honda TRX400EX Sportrax 400EX from our fit guide, and you'll get the correct unit to bolt up to the OEM header on your machine.

    With regard to sound output - FMF mufflers are typically louder than new stock mufflers. Given the age of your machine and if you haven't re-packed the muffler, it'll probably be just as loud, or slightly louder than the stock exhaust. Should you choose to use the USFS-approved spark arrestor insert that's included in the kit, most likely, the exhaust won't be much louder than stock.

    By: Staff

  • Will I need to reset my carb.

    By: AL

    In order to get the most out of this, or any other exhaust we sell, we recommend that you do indeed re-jet your carburetor. In fact, FMF has developed a range of jet kits to go along with their exhausts. In this way, you can be assured to get the best possible throttle response and engine power output along with the new muffler.

    We prefer the FMF jet kits for FMF mufflers since they're already tailored to work with their exhausts, but for some machines, they don't have 'em. In the instance you're unable to find a jet kit from FMF to fit your bike, a stage 1 jet kit from Dynojet will also do the trick.

    By: Staff

  • Replacing a Dr.D slip on with this

    I have a full Dr.D exhaust system that I want to replace just the slip-on with this slip-on. Will the slip-on fit directly onto the Dr.D header AND will I need to re-jet my carb?

    By: Fil

    Unfortunately, FMF mufflers are designed only to fit the OEM header or an FMF header. They won't fit any Dr. D exhaust components. FMF mufflers come with a spacer that's designed to fit the stock header and, if you were to upgrade to an FMF header later on, that spacer is to be removed in order to accommodate the larger pipe diameter. You won't be able to fit the FMF muffler to your machine without fitting the stock header or, upgrading to an FMF unit.

    In the instance you wanted to go all-out and upgrade the header as well, the jetting would probably be close, provided you already changed it to work with the Dr. D setup. Still, without having the machine here to examine, it's impossible to say for sure what changes, if any - would be required in order to properly deliver fuel with the new FMF exhaust system.

    By: Staff

  • Will this fit my 2002 Yamaha Warrior 350?

    By: Larry

    Yes, indeed it will! Just choose the 2002 Yamaha YFM350X Warrior 350 FMF slip-on from our fit guide and we'll get the proper FMF muffler on its way to you. These mufflers are designed to fit machines equipped with the original header or any header from FMF.

    By: Staff

  • I have a 2004 Yamaha yz450 i dont want too much sound but i want something other than stock, is this good? Any suggestions?

    By: Jerry

    The YZ450F Yamaha PowerCore 4 will certainly be a lot louder than stock, but maybe a little too loud for your tastes. For your particular needs, we'd recommend a YZ450F FMF Q4 slip-on muffler instead. It flows more exhaust gases than stock for more power gains, but the muffler's internal configuration isn't a straight-through design, so it's not terribly loud. Plus, it comes with a USFS-approved spark arrestor that's removable - so you can ride it on public lands without the worry of getting a ticket.

    Of course, since you're make a big adjustment where exhaust flow is concerned, we highly recommend that you adjust fuel delivery as well. In particular, a Dynojet Stage 1 YZ450F jet kit would be an excellent match. It comes with all required and the included instructions do an excellent job of explaining how to get everything jetted correctly from the off. In this way, you can be assured of no flat spots in throttle response and the best possible engine power output from the new Yamaha dirtbike exhaust.

    By: Staff

  • Will this fit a 2016 Suzuki drz125L

    By: Noah

    Yes, we have an FMF muffler for the Suzuki DR-Z125L. Just choose your machine from our fit guide and we'll get the proper DR-Z125L exhaust for your machine on the way to you, fast!

    By: Staff

  • Does it make your bike go faster

    By: Brandon

    The exhaust is merely one components that's required to make your bike faster. Proper fuel delivery via a jet kit (for carbureted bikes) or fuel tuner (for FI machines) and gearing matched to your needs also critical components to getting everything just right. If you're looking for faster acceleration, the muffler certainly won't hurt on that front as it'll allow the engine to breathe a little more freely and also, may shave a few pounds off your bike. Both benefits aid in increasing speed off the corner.

    By: Staff

  • i was thinking about buying this fmf power core 4 slip on exhaust system but i was starting to wonder if the fmf slip on would slip onto the stock muffler because i was looking at the picture of the slip on part and i didnt look like it would slide into my stock muffler it looked too small and another question i have is if that slip on will fit on my stock muffler will i have to change the jets in my bike because i have heard alot of people say that you will have to change the jets in your bike but i think that only consist of a full fmf exhaust system thanks you

    By: Guest

    FMF's PowerCore 4 Slip-On mufflers are designed to fit the stock header on any machine you select from our fit guide. They also fit FMF headers, so if you were to upgrade to an FMF header in the future, you won't need to purchase any additional FMF exhaust parts.

    As far as jetting goes, we highly recommend that you re-just your bike with either, an FMF jet kit or a Dynojet jet kit in order to be sure you have everything you need to get the most out of your new FMF exhaust configuration. This goes for both, the slip-on muffler as well as the full exhaust system. We always recommend re-jetting any carbureted machine upon changing the way air gets into, or out of the engine. This way, there are no flat spots in throttle response and power output potential is maximized.

    By: Staff

  • will it bolt up to a 2002 250ex

    By: hondaalltheway

    Yes, indeed it will! Just choose the 2002 Honda TRX250EX SporTrax 250 from the fit guide that's immediately to the right of the main image and you'll be all set. So long as you have either, the OEM or an FMF header on your ATV, it'll bolt straight up. In the instance you have a different header, please give us a call or just write back and we'll be happy to find the correct muffler to fit your needs.

    By: Staff

  • Will this fit on a stock 2017 klx 140 G?

    By: joey

    Actually, FMF makes a particular exhaust to fit that machine. You can find it on our FMF Racing Mini PowerCore 4 Slip-On Exhaust page. The Mini PowerCore 4 will bolt straight up to the OEM KLX140G's exhaust system.

    By: Staff

  • I have a 2001 Suzuki DR-Z400S. Is the spark arrestor removable from this muffler?

    By: GottaBeGreen

    Yes, the FMF PowerCore 4 for the DR-Z400S 2001 model comes with a removable spark arrestor. A single screw secures it in place, so removal and installation is easy whenever you need to change things up!

    By: Staff

  • I have a Honda CRF 150fF (2017) will it fit the 2017 bike or no?! Thank you

    By: Connor

    Yes, we do have an FMF slip-on to fit the 2017 Honda CRF150F. Just choose your machine from our fit guide and you'll get the correct CRF150F exhaust sent to you, fast - we guarantee it!

    By: Staff