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GYTR FMF Powercore 4 Muffler
GYTR FMF Powercore 4 Muffler

$314.99 $349.99
10% Off - Save $35.00

Description See Also: 16 Reviews 6 Questions Fitment Part Numbers
Item #GYT0033

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16 Reviews
4.9 out of 5 stars
5 Star   15 4 Star   0 3 Star   1 2 Star   0 1 Star   0
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All Reviews
Houston TX
Durability 4/5 Ease of Installation 5/5 Performance 4/5 Power 4/5 Style 4/5
Love the sound!

Bought this on sale, best buy of the year for me.

Verified Purchaser
North Idaho
Durability 5/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5
Great Value

Bought this for a 2015 WR 450 that I ride year-round on tires and as a snowbike. Made a bid difference in starting and low-end grunt. The bike revs quicker and seems snappier. I also have the YZ ECU and FMF map loaded. It is truly a slip-on system and fit perfectly. Was pleasantly surprised by the sound - not too loud, but a good bark when the RPM's are climbing.

Verified Purchaser
Hanna ut
Durability 5/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5
Fits perfectly

Gained 3 hp love the sound

Verified Purchaser
Upstate ny
Ease of Installation 5/5 Performance 5/5 Style 5/5
Great pipe

Looks good
Sounds good
No complaints

Milwaukie Oregon
Durability 3/5 Ease of Installation 3/5 Performance 3/5 Power 3/5 Style 5/5
Comes with a insert to make it an actual spark arr

This so cold spark arrestor came in the mail today and you still have to install the spark arrestor to make it an actual spark arrestor slip-on so that's kind of annoying and it didn't come with instructions on how to install the spark arrestor screen so not too pleased that I have to do some modifications to the exhaust at all

GYTR FMF Powercore 4 Muffler
GYTR FMF Powercore 4 Muffler
Verified Purchaser
Durability 5/5 Ease of Installation 4/5 Performance 5/5 Power 4/5 Style 5/5

Verified Purchaser
Bristol in
Durability 5/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5
Easy install

Bought this for a woods trip needing a spark arrestor
And it worked awesome. Simple install, didn't need any tuning

Atascadero, CA
Durability 4/5 Ease of Installation 5/5 Performance 4/5 Power 5/5 Style 4/5
16 450fx

I love the sound and it fit on perfect. Had it installed in under 10 minutes.

GYTR FMF Powercore 4 Muffler
Verified Purchaser
Parker, CO, USA
Durability 5/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5
Very pleased with the FMF Header & Silencer

I purchased the FMF GYTR Silencer and Powerbomb header for my '08 WR450F and was very pleased with the resulting quality, ease of installation and performance. The fitment was literally perfect, everything slipped together flawlessly and all the bolt holes lined up exactly. I did re-jet the main and pilot jets with help from a adjustable fuel screw while I had it apart, but the bike runs better than ever and has a nicer sound than it did with the stock silencer & header. The USFS approved spark arrestor adds some peace of mind as well. Very happy with the upgraded exhaust system overall.

GYTR FMF Powercore 4 Muffler
GYTR FMF Powercore 4 Muffler
Verified Purchaser
Ocala, FL, USA
Durability 4/5 Ease of Installation 5/5 Performance 4/5 Power 4/5 Style 5/5
Great product

Easy install ,great sound very satisfied with this pipe.

See 6 More Reviews
6 Questions
Answered:   5
Not Yet:   1
JCSingletrack
Q: Is this muffler quieter than the stock muffler on a 2017 YZ250FX?
Over 10 months ago
Isaac
Top 10
Over 10 months ago
A: The GYTR FMF Powercore 4 muffler will be louder than the stock exhaust system.
Naberhaus30
Q: Installation - Clamp
1 year 6 months ago
Do I need a clamp? Installing on my 2011 YZ450F and the stock clamp doesn't fit. Do I need one?
RyanR
1 year 6 months ago
A: No clamp needed at least as far as my '08 WR450F was concerned. FMF recommends high-temp silicone to seal the joint though.
Michaelwolf5
GYTR FMF Powercore 4 Muffler
Q: How do I get the exhaust to work good?
1 year 6 months ago
I bought this exhaust for my 2015 WR450F. But the bikes turns off when Idle, something that never happened before. I need the bike to work good and I dont like it, I followed the instructions so what's next?
Cody
Q: Would I need to purchase the EFI tuner for the 2016 yz 450f to adjust fuel injection if I were to install this pipe?
2 years 2 months ago
Garebear
2 years 2 months ago
A: No because i sliped it on my 2016 yz250f and it ran even better than before.
MotoSportExpert
Expert MotoSport Staff
2 years 2 months ago
A: Generally with a slip on exhaust you will not need a programmer. I would recommend installing the exhaust and riding the bike to see how it is running then tuning your bike from there if necessary.
John
Q: What is the weight of the GYTR FMF Powercore 4 Muffler ?
2 years 9 months ago
MotoSportExpert
Expert MotoSport Staff
2 years 9 months ago
A: The approximate weight of the GYTR FMF Powercore 4 Muffler for your 2016 Yamaha YZ250F would be 6lbs.
Darryl
Q: Is the spark arrestor USFS approved/stamped?
Over 3 years ago
GYTR FMF Powercore 4 Muffler
RyanR
Over 3 years ago
A: It sure is. There is a USFS placard on the top rear of the silencer.
MotoSportExpert
MotoSport Staff Expert
Over 3 years ago
A: Yes the GYTR FMF Powercore 4 Muffler is Forestry approved. Feel free to give us a call at 888-676-8853 and we would be happy to help you out with your order.
Fitment
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See Fitments
# Part Numbers
Product Variant Manufacturer Part #
GYTR FMF Powercore 4 Muffler N/A
GYTR FMF Powercore 4 Muffler N/A
GYTR FMF Powercore 4 Muffler 1SME47A0T000
GYTR FMF Powercore 4 Muffler 1SLE47A0T000