2Bros Parts

Factory 4.1 RCT Exhaust Silencer 21-24 Kawasaki KX 250 F X - FMF 042394

£564.92

4.1 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 Stainless Slip-On with Carbon End Cap is engineered for enthusiasts seeking leading-edge performance and durability. Featuring innovative Resonance Chamber Technology™, this slip-on exhaust delivers increased power across the RPM range while offering substantial weight reduction. The advanced Factory Forward Engineering positions the muffler closer to the powerplant for enhanced mass centralisation and improved balance, all in a robust package constructed from aerospace-grade materials at FMF's California facility. Designed exclusively for closed course competition, it incorporates FMF Resonance Chamber Technology™ for refined power delivery. Its shorter overall length enhances durability and minimises crash susceptibility. Factory Forward Engineering promotes mass centralisation by positioning the muffler nearer the engine. A Rapid Tuning System RTS allows for quick adjustments. Manufactured using aerospace-grade aluminium and stainless steel, with a carbon end cap. Includes a screen-type spark arrestor and 94dB quiet insert. Offers significant weight savings to improve handling and responsiveness. Type: Slip-On. Configuration: Single. Construction: Aluminium. Finish: Natural. Midpipe: Stainless Steel. End Cap: Carbon. Spark Arrestor: Screen Insert (included). Quiet Insert: 94dB (included). Weight: 7.5 lbs.

Specifications
SKU
06-9950.FMF.FAC
Brand
FMF Exhausts
Availability
In Stock (2)

Fitments (9)

MakeModelYear
KAWASAKIKX 250F2021
KAWASAKIKX 250F2022
KAWASAKIKX 250F2023
KAWASAKIKX 250F2024
KAWASAKIKX 250X2021
KAWASAKIKX 250X2022
KAWASAKIKX 250X2023
KAWASAKIKX 250X2024
KAWASAKIKXF 2502021
General Product Group
Exhaust Systems & Parts
General Product Type
Silencer
Variant Id
299097
Delivery2–4 business days
14-Day ReturnsHassle-free
Easy CheckoutCard friendly
Product details

FULL DESCRIPTION

FMF Racing Factory 4.1 RCT Slip-On Exhaust System with Carbon End Cap

Elevate your motorcycle's performance with the FMF Racing Factory 4.1 RCT Stainless Slip-On. Engineered for closed-course competition, this exhaust system integrates FMF's groundbreaking Resonance Chamber Technology™ to deliver enhanced power across the entire RPM range. The innovative Factory Forward Engineering positions the muffler closer to the engine, improving mass centralization and overall bike balance for a more responsive and agile ride. Constructed from aerospace-grade aluminium and stainless steel with a striking carbon fibre end cap, this system offers a significant reduction in weight, contributing to better handling and reduced rider fatigue.

Key Features:

  • Designed for closed-course competition use.
  • Features FMF Resonance Chamber Technology™ for optimized power delivery.
  • Shorter muffler design increases durability and reduces susceptibility to damage.
  • Factory Forward Engineering centralizes mass by moving the muffler closer to the engine.
  • Includes a Rapid Tuning System (RTS) for easy performance adjustments.
  • Constructed with aerospace-grade aluminium and stainless steel for superior strength and light weight.
  • Finished with a premium carbon fibre end cap.
  • Comes with a screen-type spark arrestor and a 94dB quiet insert for sound management.
  • Offers substantial weight savings over stock systems.

Specifications:

  • Type: Slip-On Exhaust
  • Configuration: Single Muffler
  • Muffler Construction: Aerospace-grade Aluminium
  • Muffler Finish: Natural
  • Mid-Pipe Material: Stainless Steel
  • End Cap Material: Carbon Fibre
  • Included Accessories: Screen Spark Arrestor, 94dB Quiet Insert
  • Approximate Weight: 7.5 lbs
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