2Bros Parts

FACTORY 4.1 RCT EXHAUST SILENCER 2008-2025 KAWASAKI KLX 140 F G L R - FMF 042383

£353.18

4.4 Trustpilot 99.9% positive on eBay

Free UK delivery 2–4 business days

Spread the cost with Klarna 18+, T&Cs apply

1

The FMF Racing Factory 4.1 RCT Slip-On Muffler brings advanced performance and durability to mini off-road bikes, featuring FMF’s exclusive Resonance Chamber Technology™ and a mass-centralised design. Built entirely from aerospace grade titanium and finished with a striking blue anodised coating, this exhaust system is engineered for significant power gains across the RPM range, improved weight savings and superior crash resilience. Developed and manufactured in Southern California to precise standards, it complements both FMF and OEM headers. Features include FMF Resonance Chamber Technology™ internally and externally, aerospace grade blue anodised titanium muffler with titanium end cap, substantial power increases throughout the rev range, major reduction in overall weight, shorter length for reduced crash damage and improved mass centralisation, Factory Forward Engineering positions the muffler closer to the engine, Rapid Tuning System (RTS) for quick adjustments, compatibility with both FMF and OEM headers, includes spark arrestor screen insert (quiet insert available separately), and is for closed course use only. Specifications: Type Slip-On, Configuration Single, Construction Titanium, Finish Blue Anodised, Midpipe Material Stainless Steel, End Cap Stainless Steel, Spark Arrestor Included (screen insert), Quiet Insert Available separately, Item ID 042383. Weight 1630 grams.

Specifications
SKU
06-072.FACT.TIT
Brand
FMF Exhausts
Availability
In Stock (2)

Fitments (65)

MakeModelYear
KAWASAKIKLX 1402008
KAWASAKIKLX 1402009
KAWASAKIKLX 1402010
KAWASAKIKLX 1402011
KAWASAKIKLX 1402012
KAWASAKIKLX 1402013
KAWASAKIKLX 1402014
KAWASAKIKLX 1402015
KAWASAKIKLX 1402016
KAWASAKIKLX 1402017
KAWASAKIKLX 1402018
KAWASAKIKLX 1402019
KAWASAKIKLX 1402020
KAWASAKIKLX 1402021
KAWASAKIKLX 140F2021
KAWASAKIKLX 140G2017
KAWASAKIKLX 140G2018
KAWASAKIKLX 140G2019
KAWASAKIKLX 140G2020
KAWASAKIKLX 140L2008
KAWASAKIKLX 140L2009
KAWASAKIKLX 140L2010
KAWASAKIKLX 140L2011
KAWASAKIKLX 140L2012
KAWASAKIKLX 140L2013
KAWASAKIKLX 140L2014
KAWASAKIKLX 140L2015
KAWASAKIKLX 140L2016
KAWASAKIKLX 140L2017
KAWASAKIKLX 140L2018
KAWASAKIKLX 140L2019
KAWASAKIKLX 140L2020
KAWASAKIKLX 140L2021
KAWASAKIKLX 140R2021
KAWASAKIKLX 140R2022
KAWASAKIKLX 140R2023
KAWASAKIKLX 140R2024
KAWASAKIKLX 140R2025
KAWASAKIKLX 140R F2022
KAWASAKIKLX 140R F2023
KAWASAKIKLX 140R F2024
KAWASAKIKLX 140R F2025
KAWASAKIKLX 140R L2022
KAWASAKIKLX 140R L2023
KAWASAKIKLX 140R L2024
KAWASAKIKLX 140R L2025
KAWASAKIKLX G 1402017
KAWASAKIKLX G 1402018
KAWASAKIKLX G 1402019
KAWASAKIKLX G 1402020
KAWASAKIKLX G 1402021
KAWASAKIKLX L 1402008
KAWASAKIKLX L 1402009
KAWASAKIKLX L 1402010
KAWASAKIKLX L 1402011
KAWASAKIKLX L 1402012
KAWASAKIKLX L 1402013
KAWASAKIKLX L 1402014
KAWASAKIKLX L 1402015
KAWASAKIKLX L 1402016
KAWASAKIKLX L 1402017
KAWASAKIKLX L 1402018
KAWASAKIKLX L 1402019
KAWASAKIKLX L 1402020
KAWASAKIKLX L 1402021
SKU
06-072.FACT.TIT
Brand
FMF Exhausts
Availability
In Stock (2)
Delivery2–4 business days
14-Day ReturnsHassle-free
Easy CheckoutCard friendly
Product details

FULL DESCRIPTION

FMF Racing Factory 4.1 RCT Slip-On Muffler

The FMF Racing Factory 4.1 RCT Slip-On Muffler is engineered to deliver advanced performance and exceptional durability for mini off-road motorcycles. This exhaust system features FMF's exclusive Resonance Chamber Technology, integrated both internally and externally, for optimized power delivery. Its mass-centralized design, achieved through Factory Forward Engineering, positions the muffler closer to the engine, improving handling and reducing the potential for crash damage. Constructed entirely from aerospace-grade titanium, it offers significant weight savings and enhanced crash resilience. The striking blue anodised finish on the muffler, complemented by a titanium end cap, provides a visually appealing and robust exterior.

Key Features:

  • Incorporates FMF Resonance Chamber Technology™ for improved performance.
  • Crafted from aerospace-grade titanium with a blue anodised finish and titanium end cap.
  • Delivers substantial power increases across the entire RPM range.
  • Significantly reduces overall weight compared to stock systems.
  • Shorter length design enhances mass centralization and minimizes crash impact.
  • Factory Forward Engineering moves the muffler closer to the engine for better dynamics.
  • Equipped with Rapid Tuning System (RTS) for quick and easy adjustments.
  • Compatible with both FMF and OEM headers for versatile installation.
  • Includes a spark arrestor screen insert for emissions compliance.
  • A quiet insert is available separately for noise reduction.
  • Designed for closed course competition use only.

Specifications:

  • Type: Slip-On
  • Configuration: Single exhaust system
  • Muffler Construction: Titanium
  • Muffler Finish: Blue Anodised
  • Midpipe Material: Stainless Steel
  • End Cap Material: Titanium
  • Spark Arrestor: Included (screen insert)
  • Quiet Insert Compatibility: Available separately
Before you buy

QUESTIONS? JUST ASK

Talk to John or Phil. Real people, Monday to Friday, 10:00 to 17:00.

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.

UK delivery is £4.99, or free on orders over £60. Orders ship within 3 working days, then delivery takes 2–4 business days. 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.

More answers in our FAQ.

Trade pricing available

Buying parts for your business? Apply for a 2BrosParts trade account.

Apply for Trade
1