FMF's Factory 4.1 RCT Full Exhaust System incorporates the latest in RCT (Resonance Chamber Technology) both internally and externally. The core's shape lowers decibels without compromising power output. In addition, FMF designed the exhaust specifically to achieve a shorter overall length so as to be less susceptible to crash damage. Complementary to FMF's Factory Forward Engineering, the muffler is also moved closer to the motor to centralize mass and improve handling. The Factory 4.1 RCT is constructed from only aerospace grade materials that meet the California company's exacting specifications.
Each exhaust comes with FMF's proprietary MegaBomb header. The science behind the MegaBomb header actually reduces noise levels by as much as 1.5 dB when compared to conventionally-shaped headers to keep race and track officials happy. In addition, the headers are designed to produce more low end to mid range gains as well as broadening out the mid to top end power gains when compared to the stock exhaust layout.
Massive power gains throughout the entire RPM range
MegaBomb header for the ultimate in power output
Huge weight savings when compared to the stock exhaust
Fabricated using the highest quality proprietary blend of alloy grade materials
FMF RTS (Rapid Tuning System) makes for easy exhaust insert changes
Includes USFS-approved spark arrestor and quiet insert
Comes with all required mounting hardware and easy-to-follow installation instructions
Made in the USA
Product Note:
Specification
Details
Color
Varies (make selection above)
Country of Origin
USA
Finish
Varies (make selection above)
Header
Varies (make selection above)
Header Construction
Varies (make selection above)
Mid-Pipe
Varies (make selection above)
Muffler End Cap
Carbon Fiber
Muffler Sleeve
Varies (make selection above)
USFS Approved Spark Arrestor
Yes
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.
We put this on our 2019 yfz450r and absolutely woke that thing up! Definitely worth every dime, and the guys here at parts giant super helpful getting me everything I needed to get it on right!
bad***!
By Horasio M. on
Verified Purchaser
Worth every dollar!
FMF! Enough said!
By PGU on
I have a 2015 Crf450r I bolted this up and she rips! Nice and loud, the throttle response is super crisp. You can’t beat it.
How many stars would you give this product? Write a review.
Will this husky 450 kit fit on my 2015 Husqvarna FE 501?
By Josh
FMF went from manufacturing complete kits to an a la carte part number system. So, for most bikes, including the 2015 Husqvarna FE 501 - you have to purchase the header and the muffler separately.
To get a full exhaust for your bike, choose your exact model from our FMF Stainless Steel MegaBomb Header and FMF Factory 4.1 RCT SL Slip-On Exhaust pages and you'll get everything you need!
So this price listed is for the header and muffler in the blue? not just the muffler
By Dirty D
i have a 2018 RMZ450
For the RM-Z450 FMF Factory 4.1 exhaust, if you were to select the muffler that has a titanium sleeve with carbon fiber end cap, you'd receive a complete exhaust system, header to muffler, with a blue muffler sleeve.
So this is full exhaust and it does fit yfz450r 2017
By Juan
If you were to choose the 2017 Yamaha YFZ450R ATV FMF exhaust from our fit guide, you'd receive the correct exact to fit that machine. We guarantee it!
Verified Purchaser
