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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$382.49

MSRP: $374.99 - $424.99 - You save up to $52.50 (14% off)

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    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.

  • 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

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0 of 0 people found this review helpful.

Improved Throttle Response

Comments On Feb 03, 2016: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.

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1 of 1 people found this review helpful.

Great Silencer

Comments On Jan 27, 2016: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.

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SUPER improvement over OEM

Comments On Aug 07, 2015:See the title. Significantly lighter & huge performance improvement

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Comments On Mar 27, 2015:Lined up perfectly with stock header and subframe. Came with a lower mount bolt, spark arrester, and wash plug. Have several ride on it and it definitely woke up the CRF a bit. Was hit directly on the muffler by another rider and other than some tire marks there was no damage. Can take some abuse. Not sure why the SS version doesn't come with the ufo single side panel.

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