FMF Factory 4.1 RCT Slip-On Muffler for Yamaha YZ450F and YZ450FX

The FMF Factory 4.1 RCT Slip-On Muffler is designed to deliver high-performance exhaust enhancement for offroad motorcycles, specifically compatible with Yamaha YZ450F and YZ450FX models from 2018 to 2022. Incorporating the latest resonance chamber technology, this muffler reduces sound levels without compromising power, ensuring a more refined riding experience. Its innovative design features a patented core shape that optimizes exhaust flow while minimizing noise, providing maximum performance with quieter operation. The canister shape is also patented to increase internal volume, allowing more sound-absorbing material to be used, which further dampens noise for a smoother ride. The chamber design is engineered to refine exhaust pressure, improving engine efficiency and throttle response.
The Factory 4.1 incorporates factory-forward engineering principles, centralizing mass to reduce the risk of crash damage and improve overall durability. Tuned specifically for each application, the exhaust core specifications are optimized to enhance power output and torque across the RPM range. The rear endcap features a simple installation design that accommodates tuning tip inserts or a spark arrestor, making it easy to customize or meet local regulations. Constructed with a lightweight titanium midpipe, this muffler significantly reduces weight, contributing to better handling and agility during offroad riding. Suitable for riders seeking a combination of performance, durability, and noise reduction, the FMF Factory 4.1 RCT slip-on muffler is an ideal upgrade for Yamaha offroad motorcycles seeking competitive edge and reliability.
Durable and easy to install, this slip-on muffler enhances your motorcycle’s exhaust system with advanced chamber technology and a lightweight titanium construction. Whether you're racing or riding for recreation, this exhaust system provides a noticeable improvement in performance, sound, and aesthetics. Trust FMF’s expertise in offroad exhaust systems to elevate your Yamaha motorcycle’s capabilities with this high-quality, race-inspired muffler.

Features:

• All-new resonance chamber technology for quieter operation without sacrificing power

• Patented core shape reduces sound levels while maintaining maximum output

• Patented canister shape increases internal volume for enhanced sound absorption

• Patented chamber design to improve and refine exhaust pressure

• Factory-forward engineering centralizes mass for durability and crash resistance

• Tuned exhaust core for optimized performance across specific applications

• Innovative rear endcap allows easy installation of tuning tips or spark arrestors

• Titanium midpipe offers extreme lightweight benefits for improved handling

Product Type: Exhaust
Exhaust Type: Slip-On Muffler
Model: FACTORY 4.1
Segment: Offroad
Division: Exhaust
Class: Mufflers, Pipes, & Systems
Sub Class: Exhaust Systems

FITMENT:
2018 Yamaha YZ450F
2019 Yamaha WR450F
2019 Yamaha YZ450F
2019 Yamaha YZ450FX
2020 Yamaha YZ450F
2020 Yamaha YZ450FX
2021 Yamaha YZ450F
2021 Yamaha YZ450FX
2022 Yamaha YZ450F
2022 Yamaha YZ450FX
2023 Yamaha YZ450F
2023 Yamaha YZ450FX
2024 Yamaha YZ450F
2024 Yamaha YZ450FX