FMF | SKU: 6108110

FMF Exhaust - 45658 - Slip On Muffler - Anodised Titanium - Factory 4.1 RCT

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FMF Exhaust - 45658 - Slip On Muffler - Anodised Titanium - Factory 4.1 RCT

~~$1,099.00~~ $1,028.00

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FMF Exhaust - 45658 - Slip On Muffler - Anodised Titanium - Factory 4.1 RCT

~~$1,099.00~~ $1,028.00

The FMF Factory 4.1 RCT is a slip-on muffler built around FMF's Resonance Chamber Technology, applied both internally and externally to broaden power delivery across the rev range. Its shorter canister sits closer to the engine in line with FMF's Factory Forward Engineering approach, centralising mass and leaving less muffler hanging out where it can be damaged in a crash.

Made from aerospace-grade materials and manufactured at FMF's Southern California factory, this version pairs an anodised titanium canister with a carbon fibre end cap and a stainless steel mid-pipe. It suits enduro and off-road riders on the Sherco four-stroke platform who want a noticeable weight saving and a genuine performance lift over the standard muffler. Part number 45658.

FMF Resonance Chamber Technology (RCT) applied internally and externally
Anodised titanium canister with carbon fibre end cap
Stainless steel mid-pipe
Shorter overall length for reduced crash damage exposure
Factory Forward Engineering positions the muffler closer to the motor to centralise mass
Significant weight saving over the standard muffler
Power gains throughout the RPM range
RTS (Rapid Tuning System)
Aerospace-grade materials, manufactured in FMF's Southern California factory
Direct slip-on fitment for Sherco 250 FSE / 300 FSE

FMF Factory 4.1 RCT slip-on muffler with carbon fibre end cap

Brand	FMF
Model	Factory 4.1 RCT Slip-On Muffler
Part Number	45658
Type	Slip-on muffler
Canister Material	Anodised titanium
End Cap	Carbon fibre
Mid-Pipe	Stainless steel
Colourway	Blue anodised titanium with carbon fibre end cap
Fitment	Sherco 250 FSE / 300 FSE 2018-2023
Technology	Resonance Chamber Technology (RCT), Factory Forward Engineering, RTS (Rapid Tuning System)
Manufactured In	Southern California, USA
SKU	6108110

Confirm fitment against your exact model and year before installing, and check the muffler clears the subframe, shock and bodywork.
Fit the muffler with the engine cold, seat the mid-pipe joint fully, then tighten clamps and mounting bolts evenly - snug, not overtightened, as titanium and carbon can be damaged by excessive clamping force.
After the first ride, re-check the clamps, mounting bolts and any retaining springs, then re-check them periodically as part of your normal pre-ride inspection.
Handle the carbon fibre end cap with care; it can crack or chip under impact or if bolts are overtightened.
Allow the muffler to cool fully before cleaning. Use warm soapy water or a dedicated non-abrasive metal or carbon-safe cleaner and a soft cloth - avoid harsh solvents, oven cleaners and abrasive pads.
Discolouration and a bronze or blue heat tint on the titanium is normal with use and is not a fault.
When washing the bike, plug the muffler outlet and avoid aiming a pressure washer directly into the outlet or at the packing seams.
The muffler is repackable - replace the internal packing when the note becomes noticeably louder, exhaust residue appears around the end cap, or performance drops off. Riding with worn-out packing reduces power and can damage the internals.
Avoid spraying chain lube, degreaser or fuel onto the canister, and clean off any overspray promptly.
Store the bike with the muffler dry; if the bike will sit for a long period, keep the outlet covered to stop moisture and pests entering.