Home » FMF 4.1 RCT Titanium Slip-On KTM / GASGAS / Husqvarna 350-450cc (2019-2023)
FMF 4.1 RCT Titanium Slip-On KTM / GASGAS / Husqvarna 350-450cc (2019-2023)
FMF Racing

FMF 4.1 RCT Titanium Slip-On KTM / GASGAS / Husqvarna 350-450cc (2019-2023)

SKU: FMF045629
No reviews
Out of stock
$854.99
Product details
  • Type Exhaust
  • MPN 045629
Compatible Models +
Make & Model Year Range
GASGAS EX 350F 2021 - 2023
GASGAS EX 450F 2021 - 2023
GASGAS MC 350F 2023 - 2023
GASGAS MC 450F 2021 - 2023
HUSQVARNA FC 450 Rockstar Edition 2018 - 2018
HUSQVARNA FC 450 Rockstar Edition 2020 - 2021
HUSQVARNA FC 350 2019 - 2022
HUSQVARNA FC 450 2019 - 2022
HUSQVARNA FX 350 2019 - 2022
HUSQVARNA FX 450 2019 - 2022
KTM 450 SX-F Factory Edition 2018 - 2018
KTM 350 XC-F Kailub Russell Edition 2021 - 2021
KTM 450 SX-F Factory Edition 2020 - 2021
KTM 350 SX-F 2019 - 2022
KTM 350 XC-F 2019 - 2022
KTM 450 SX-F 2019 - 2022
KTM 450 XC-F 2019 - 2022

Overview

The FMF Factory 4.1 RCT Slip-On is built to win. Tuned for KTM, Husqvarna, and GASGAS 350F–450F models (2019–2023), this race-bred system delivers serious horsepower gains across the RPM range, drops weight, and improves mass centralization with a compact design. With aerospace-grade titanium and carbon fiber construction, it’s as tough as it is powerful.

Key Features

  • Proven Power Gains: Boosts torque and horsepower throughout the powerband.
  • Lightweight Titanium Build: Blue anodized titanium can and midpipe shed weight without sacrificing strength.
  • Carbon Fiber End Cap: Lightweight and race-ready, it adds durability and premium finish.
  • Resonance Chamber Technology: FMF’s RCT design increases performance and reduces sound.
  • Rapid Tuning System (RTS): Makes tuning fast and easy for different riding conditions.
  • Factory Forward Engineering: Moves muffler closer to engine for better mass centralization and less crash damage.
  • Spark Arrestor & 94dB Insert Included: Comes trail-ready right out of the box.
  • Made in the USA: Built in FMF’s Southern California factory with elite craftsmanship.

Specifications

  • Item ID: 045629
  • Fitment: KTM, Husqvarna, GASGAS 350F–450F (2019–2023)
  • Type: Slip-On
  • Configuration: Single
  • Construction: Titanium
  • Finish: Blue Anodized
  • Midpipe: Titanium
  • Endcap: Carbon
  • Spark Arrestor: Screen Insert (included)
  • Quiet Insert: 94dB Insert (included)
  • Weight: 6.8 lbs.
  • Carb Warning: No

If you're chasing podiums, the FMF 4.1 RCT Slip-On is the upgrade your 350–450F deserves.

WARNING: Closed Course Use Only

Shipping Information

We strive to get your order to you as quickly as possible! Here’s what you need to know about our shipping policies:

Fast Shipping: Most items ship within the same day or within 48 hours of your order being placed.

Custom Orders: Please allow additional processing time for custom or made-to-order products.

Flat Rate Shipping: Enjoy $9 Flat Rate Shipping on all standard orders.

Free Shipping:

Orders over $90 qualify for FREE shipping!

Always FREE shipping on:

  • ASV Levers
  • Rough Country Products
  • S3 Power Sports Products

No Sales Tax Outside Minnesota: Since we only have a tax nexus in Minnesota, sales tax is only collected on orders shipped within MN.

Customers with shipping addresses outside Minnesota automatically save on sales tax—just one more way to get great value!

(Please consult your local tax policies for compliance in your area.)

We’re committed to delivering your products efficiently and reliably. Thank you for choosing us!

Let customers speak for us

from 25 reviews
Great service

Was looking for the limited addition new glory harnesses and sent a message to make sure they had them in stock. Got a quick response and went ahead and ordered he shipped them out next day. Super happy with the service.

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Great value and fits perfect!

I’m really happy with my purchase!

Devin Ketel
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Fast shipping, accurate order

AND THANK YOU FOR ALL THE AWESOME SCHWEEEET STICKERS !!!! Y’all rock & stuff

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Just bought a 6d helmet...and we are very happy with the great service from Ryan would use Redplate again and we live in north idaho

Ryan
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Excellent service and reached out to make sure I got what I needed. Got the lever in under a week here in Kentucky. Actually ordered another for another bike because of service.

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