In stock

FMF Factory 4.1 RCT Slip-On Muffler — Titanium with Carbon Fiber End Cap — YZF450F/FX

FMF · #1821-1840 · Slip-Ons / Exhaust

RCT (Resonance Chamber Technology) features a patented core shape that lowers decibels while maintaining maximum power output
Internal ducts in the chambers of the RCT system increase internal volume for improved exhaust flow, resulting in power gains throughout the entire range of power
FMF's Factory Forward Engineering centralizes mass and is less prone to crash damage
Innovative rear end cap features simple installation of tuning tip inserts or spark arrestor with the removal of four screws
Meets AMA and FIM sound requirements

$849.99

In stock. Ships in 2–4 business days · free shipping over $150.

Questions? Call the shop: 801-361-3010

Real shop · real humans · 1231 N 1300 W Ste A, Centerville, UT 84014

Shop all FMF
Everything we carry from FMF →

Description & features9 features

RCT (Resonance Chamber Technology) features a patented core shape that lowers decibels while maintaining maximum power output
Internal ducts in the chambers of the RCT system increase internal volume for improved exhaust flow, resulting in power gains throughout the entire range of power
FMF's Factory Forward Engineering centralizes mass and is less prone to crash damage
Innovative rear end cap features simple installation of tuning tip inserts or spark arrestor with the removal of four screws
Meets AMA and FIM sound requirements
QuietCore 94 dB insert included
Spark arrestor included in muffler
Made in the USA
Compatible with stock header or FMF header.

Specifications11 specs

Model: Factory 4.1 RCT
Muffler Color/Finish: Blue, Anodized
Units: Each
Type: Slip-On
End Cap Material: Carbon Fiber
End Cap Color/Finish: Black
Riding Style: Off-Road
Muffler Material: Titanium
Shipping weight: 8.35 lb
Package size: 42.8 × 8.5 × 8 in
Country of origin: USA

Fitment2 models · Yamaha

Yamaha2 models

YZ450F2018–2026
YZ450FX2019–2025

Fitment comes from the catalog data for this part. Double-check your year, model and trim before you order — or call the counter at 801-361-3010 and we’ll check it with you.

Part numbers

Salto part #: 1821-1840
FMF part #: 044445

Shipping

In stock. Ships in 2–4 business days by ground.

Ground shipping is $14.95, free on orders over $150. Stock is checked again before your card is charged.

Questions4 answers

Is it in stock?: Yes — it’s in stock right now. We check again the moment you order, before anything is charged.
How fast will it get to me?: Usually 2–4 business days by ground.
Will it fit my machine?: It’s listed for the models in the Fitment section above. Not sure about your trim or year? Call the counter at 801-361-3010 and we’ll check it with you.
Is this genuine FMF?: Yes. It’s new and genuine, straight from Salto — FMF part #044445.