FMF Factory-4.1 RCT Aluminum Silencer with Stainless Steel End Cap

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FMF Factory-4.1 RCT Aluminum Silencer with Stainless Steel End Cap
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FMF Factory-4.1 RCT Aluminum Silencer with Stainless Steel End Cap

Our Price: $322.49$343.99

MSRP: $374.99 - $399.99 - You save up to $56.00 (14% off)

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Additional Videos

FMF Factory | Inside Look

FMF Factory 4.1 RCT Sound Bite

RM YouTube Channel

Details

    The quality of FMF’s Factory 4.1 RCT Aluminum Silencer with Stainless Steel End Cap is apparent right from the get go. The aerospace-grade aluminum body has been bumped up in volume to fit more packing material for longer-lasting, low-decibel sound output. FMF also uses unique Resonance Chamber Technology™ (RCT) at the front of the slip-on to ensure compliance with the FIM 2M max sound test and meet stringent AMA sound requirements.

    The RCT design not only maintains your bike’s maximum output, but the patented chamber design refines and enhances your exhaust pressure, giving you tunable gains throughout your rpm range. And you can put these gains right where you want them since to the stainless end cap—just like the Carbon 4.1 RCT end cap—allows you to swap out tuning inserts to suit your preference. Swapping between tips or servicing your exhaust also won’t be a hassle since access is made easy with four screws on the end cap. FMF walks the walk and talks the talk. Quality components and extensive knowledge combine in the FMF Factory 4.1 RCT Silencer to create a slip-on you’ll love.

    Specs:
  • Spark arrested, tunable silencer for your 4 stroke ATV or dirt bike
  • Rapid Tuning System (RTS)
  • Fits on FMF or OEM header
  • Resonance Chamber Technology (RCT)
  • Increased packing material volume
  • Meets AMA and FIM sound requirements
  • Quiet Core 94db insert included
  • Spark arrestor included in muffler
  • 100% American made in California
  • Easily maintained and repacked with removable end cap
  • Stainless steel end cap

FMF Factory-4.1 RCT Aluminum Silencer with Stainless Steel End Cap Reviews

Each review submitted enters you into a
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4.7 / 5.0
11 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Stars
8
3
0
0
0
Value
4.7 / 5
Durability
4.7 / 5
Ease of Installation
4.3 / 5
Fitment
4.7 / 5
Performance
4.8 / 5
Finish
4.7 / 5
Features
5.0 / 5
Recommend it?
Yes (6)
Value
5 / 5
Durability
5 / 5
Ease of Installation
5 / 5
Fitment
5 / 5
Performance
4 / 5
Finish
4 / 5
Features
5 / 5
Recommend it?
Yes
Great with no spark arrestor
Good performance with the spark arrestor out. Put the spark arrestor in and you might as well stay stock.
April 26, 2018
Los lunas, NM, US
Purchased
over 2 years ago
Value
5 / 5
Durability
5 / 5
Ease of Installation
5 / 5
Fitment
5 / 5
Performance
5 / 5
Finish
5 / 5
Features
5 / 5
Recommend it?
Yes
Great muffler. It's easy to install and the tone is great. A little louder than stock on my xcf but not obnoxious.
March 29, 2017
Boise , ID, US
Age: 25-44
Purchased
1 year ago
Gender:
Male
Weight:
191 - 220 lbs.
Height:
6'1 - 6'3
Value
5 / 5
Durability
5 / 5
Ease of Installation
2 / 5
Fitment
4 / 5
Performance
5 / 5
Finish
5 / 5
Features
5 / 5
Recommend it?
Yes
Great Product, installation has challenge
Added power, throttle response and crisp sound. I love this pipe but only negative comment I have is FMF doesn't send an extra spring with this silencer. Also the mounting angle of the spring slot is rotated by a lot. Stock is on bottom and fmf is about 10 o clock on the pipe. Put the spring on stock pipe first and than use silencer as a pulling device and pull the spring and then align pipes. The only way to do it honestly. But overall great purchase and power for enduros.

-m-2014 KTM 450 XC-F--
March 14, 2017
Amarillo, TX, US
Age: 25-44
Purchased
1 year ago
Gender:
Male
Weight:
191 - 220 lbs.
Height:
6'1 - 6'3
Value
4 / 5
Durability
4 / 5
Ease of Installation
5 / 5
Fitment
5 / 5
Performance
5 / 5
Finish
5 / 5
Features
5 / 5
Recommend it?
Yes
Great Product! What you'd expect from FMF
I got one of these for my 16' KTM 350. It added a bunch of bottom and mid-range power. It let the bike breathe better too. Plus it looks amazing!

-m-DIRT BIKE--
March 1, 2017
Bountiful, UT, US
Age: 15-24
Purchased
1 year ago
Gender:
Male
Value
4 / 5
Durability
5 / 5
Ease of Installation
4 / 5
Fitment
5 / 5
Performance
5 / 5
Finish
5 / 5
Features
5 / 5
Recommend it?
Yes
Sounds great and revs so much faster would very much so recommend spend the the extra money.
February 8, 2017
Elk park, NC, US
Age: 15-24
Purchased
1 year ago
Gender:
Male
Weight:
161 - 190 lbs.
Height:
6'1 - 6'3
Value
5 / 5
Durability
4 / 5
Ease of Installation
5 / 5
Fitment
4 / 5
Performance
5 / 5
Finish
4 / 5
Features
5 / 5
Recommend it?
Yes
Worth it
Bolted right up with a clean look and finish on my 2013 yz250f. I had to do a little trimming of the side number plate around the silencer to prevent it from melting but It has a nice deep and loud sound and gives it a nice throttle response
December 19, 2016
Cloverdale, IN, US
Age: 15-24
Purchased
over 2 years ago
Gender:
Male
Weight:
161 - 190 lbs.
Height:
6'1 - 6'3
Great power
I bought this silencer to go with the mega bomb header and wow it really woke the bike up a lot of snap off the bottom you can feal in the seat of the pants.

Machine this part was bought for: 2011 YAMAHA YZ250F
May 7, 2016
PA
Improved Throttle Response
Great fit and finish. Super easy to install with OEM header. Slightly louder but not too bad. I have the spark arrestor inserted for trail riding and the bike revs much quicker on the low end which helps acceleration. No noticeable change to mid or top end power.

I am uncertain if power output has improved but the acceleration is smoother and quicker off idle which makes it a great product.

I would not hesitate to buy another one.

Machine this part was bought for: 2014 KTM 350 XCF-W
February 3, 2016
AZ
Great Silencer
Easy installation. Sounds great. Noticed a slight increase in power from the bottom to the top on my 2012 YZ250F. Can't go wrong with FMF.

Machine this part was bought for: 2012 YAMAHA YZ250F
January 27, 2016
Albuquerque, NM, US
Age: 25-44
Gender:
Male
Weight:
161 - 190 lbs.
Height:
5'10 - 6'0
SUPER improvement over OEM
See the title. Significantly lighter & huge performance improvement

Machine this part was bought for: 2014 KTM 450 XC-W
August 7, 2015
Des Moines, IA, US
Each question or answer submitted enters you into a:
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$500 gift card quarterly drawing!
Start typing your question and we'll check if it was already asked and answered. Learn More
Browse 3 questions Browse 3 questions and 14 answers
Does the muffler have the usfs approved label on it?
Casey W on Jan 20, 2017
BEST ANSWER: Yes, it comes as a metalized label, to put on the inside of the end cap, per the instructions, maybe because the screen type arrestor is removable. I would have rather seen it stamped to the back of the end cap or can.
Will this fit a 2014 ktm 500 exc?
Kevin B on Mar 18, 2018
BEST ANSWER: To see if this part will fit your machine please enter the make, model, and year into our "Choose a vehicle" drop down boxes found above the product image. If your machine is not listed, we may not carry the right item for your application. If you have a 2018 year model but don't see your machine as an option, please contact a tech via Live Chat or call us at 1-800-336-5437 for assistance.
Will this pipe fit a 2014 KTM 350 XC-F? I see it fits the 2014 350 EXC-F, but aren't they basically the same?
Jacob P on Dec 7, 2017
BEST ANSWER: Unfortunately this specific silencer with stainless steel end cap will not fit the XC-F model. I show that there are options for a carbon or titanium end cap only for the 2014 XC-F model.
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