2Bros Parts

Factory 4.1 RCT Exhaust Silencer 18-23 KTM Husqvarna GasGas 350 450 - FMF 045628

$705.39

4.1 Trustpilot 99.9% positive on eBay

Delivery to United States 5–8 business days

Spread the cost with Klarna

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The FMF Racing Factory 4.1 RCT Stainless Slip-On with Carbon End Cap features FMF Resonance Chamber Technology for advanced performance. Its compact design and Factory Forward Engineering centralize mass by moving the muffler closer to the engine, improving handling. Constructed from aerospace-grade materials, this slip-on system provides significant power gains and weight savings. Features include a closed course use only specification, slip-on configuration, natural aluminium construction with a carbon end cap, and a stainless steel midpipe. It comes with a screen-type spark arrestor insert and a 94dB quiet insert. The system offers a substantial weight advantage at 7.4 lbs, a massive power increase across the RPM range, and RTS Rapid Tuning System for easy tuning. It boasts a robust, corrosion-resistant build and is exclusively manufactured from proprietary alloy-grade titanium and premium materials. Item ID is 045628, type is Slip-On, configuration is Single, construction is Aluminium, finish is Natural, midpipe is Stainless Steel, and endcap is Carbon. A screen insert spark arrestor and a 94dB quiet insert are included. Weight is 7.4 lbs.

Specifications
SKU
06-9907.F4
Brand
FMF Exhausts
Availability
In Stock (3)

Fitments (70)

MakeModelYear
GASGASEX 250F2021
GASGASEX 250F2022
GASGASEX 250F2023
GASGASEX 350F2021
GASGASEX 350F2022
GASGASEX 350F2023
GASGASEX 450F2021
GASGASEX 450F2022
GASGASEX 450F2023
GASGASMC 250F2021
GASGASMC 250F2022
GASGASMC 250F2023
GASGASMC 350F2021
GASGASMC 350F2022
GASGASMC 350F2023
GASGASMC 450F2021
GASGASMC 450F2022
GASGASMC 450F2023
HUSQVARNAFC 2502019
HUSQVARNAFC 2502020
HUSQVARNAFC 2502021
HUSQVARNAFC 2502022
HUSQVARNAFC 3502019
HUSQVARNAFC 3502020
HUSQVARNAFC 3502021
HUSQVARNAFC 3502022
HUSQVARNAFC 4502019
HUSQVARNAFC 4502020
HUSQVARNAFC 4502021
HUSQVARNAFC 4502022
HUSQVARNAFC 450 ROCKSTAR EDITION2018
HUSQVARNAFC 450 ROCKSTAR EDITION2019
HUSQVARNAFC 450 ROCKSTAR EDITION2020
HUSQVARNAFC 450 ROCKSTAR EDITION2021
HUSQVARNAFX 3502019
HUSQVARNAFX 3502020
HUSQVARNAFX 3502021
HUSQVARNAFX 3502022
HUSQVARNAFX 4502019
HUSQVARNAFX 4502020
HUSQVARNAFX 4502021
HUSQVARNAFX 4502022
KTM250 SX-F2019
KTM250 SX-F2020
KTM250 SX-F2021
KTM250 SX-F2022
KTM250 XC-F2019
KTM250 XC-F2020
KTM250 XC-F2021
KTM250 XC-F2022
KTM350 SX-F2019
KTM350 SX-F2020
KTM350 SX-F2021
KTM350 SX-F2022
KTM350 XC-F2019
KTM350 XC-F2020
KTM350 XC-F2021
KTM350 XC-F2022
KTM350 XC-F KAILUB RUSSELL2021
KTM450 SX-F2019
KTM450 SX-F2020
KTM450 SX-F2021
KTM450 SX-F2022
KTM450 SX-F FACTORY EDITION2018
KTM450 SX-F FACTORY EDITION2020
KTM450 SX-F FACTORY EDITION2021
KTM450 XC-F2019
KTM450 XC-F2020
KTM450 XC-F2021
KTM450 XC-F2022
General Product Group
Exhaust Systems & Parts
General Product Type
Silencer
Variant Id
287708
Delivery5–8 business days
14-Day ReturnsHassle-free
Easy CheckoutCard friendly
Product details

FULL DESCRIPTION

FMF Racing Factory 4.1 RCT Exhaust Silencer with Carbon End Cap

Experience the pinnacle of exhaust technology with the FMF Racing Factory 4.1 RCT Stainless Slip-On. This system integrates FMF Resonance Chamber Technology™ internally and externally, delivering enhanced performance and sound. Its compact, crash-resistant design and Factory Forward Engineering reposition the muffler closer to the engine, improving mass centralization for superior handling.

Key Features:

  • Closed course use only.
  • Slip-on configuration for easy installation.
  • Constructed from aerospace-grade aluminium with a striking carbon fiber end cap.
  • Durable stainless steel midpipe.
  • Includes a screen-type spark arrestor insert for compliance.
  • Comes with a 94dB quiet insert for reduced noise levels.
  • Offers a significant weight reduction, weighing only 7.4 lbs.
  • Provides a massive power increase across the entire RPM range.
  • Features RTS (Rapid Tuning System) for straightforward tuning adjustments.
  • Built for robustness and resistance to corrosion.
  • Manufactured exclusively from proprietary alloy-grade titanium and premium materials in Southern California.

Specifications:

  • Type: Slip-On
  • Configuration: Single
  • Construction Material: Aluminium
  • Finish: Natural
  • Midpipe Material: Stainless Steel
  • End Cap Material: Carbon Fiber
  • Spark Arrestor: Screen insert (included)
  • Quiet Insert: 94dB insert (included)
  • Weight: 7.4 lbs
Before you buy

QUESTIONS? JUST ASK

Talk to John or Phil. Real people, Monday to Friday, 10:00 to 17:00 (UK time).

Call us+44 330 133 3748
Email us[email protected]

Check the fitment table on this page against your make, model and year. Not sure? Call or email us and we will check it for you before you order.

Yes. We ship from the UK. Orders ship within 3 working days, then delivery to the United States takes 5–8 business days. The delivery price is shown at checkout before you pay. Delivery details

Yes. You have 14 days from delivery to return it, unused and in its original packaging. Contact us first and we will send you the return instructions. Returns policy

By card, PayPal, Apple Pay or Google Pay, or spread the cost with Klarna. Payment is taken securely by Stripe, and the options for your order are shown at checkout.

Any customs duties or import taxes charged in the United States are paid by you when the parcel arrives. Any tax we collect ourselves is shown at checkout before you pay.

More answers in our FAQ.

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