"KTM 350 SX-F 2019",
"KTM 350 SX-F 2020",
"KTM 350 SX-F 2021",
"KTM 350 SX-F 2022",
"KTM 350 XC-F 2019",
"KTM 350 XC-F 2020",
"KTM 350 XC-F 2021",
"KTM 350 XC-F 2022",
"KTM 350 XC-F Kailub Russell 2021",
"KTM 450 SX-F 2019",
"KTM 450 SX-F 2020",
"KTM 450 SX-F 2021",
"KTM 450 SX-F 2022",
"KTM 450 SX-F Factory Edition 2018",
"KTM 450 SX-F Factory Edition 2020",
"KTM 450 SX-F Factory Edition 2021",
"KTM 450 XC-F 2019",
"KTM 450 XC-F 2020",
"KTM 450 XC-F 2021",
"KTM 450 XC-F 2022",
"HUSQVARNA FC 350 2019",
"HUSQVARNA FC 350 2020",
"HUSQVARNA FC 350 2021",
"HUSQVARNA FC 350 2022",
"HUSQVARNA FC 450 2019",
"HUSQVARNA FC 450 2020",
"HUSQVARNA FC 450 2021",
"HUSQVARNA FC 450 2022",
"HUSQVARNA FC 450 Rockstar Edition 2018",
"HUSQVARNA FC 450 Rockstar Edition 2020",
"HUSQVARNA FC 450 Rockstar Edition 2021",
"HUSQVARNA FX 350 2019",
"HUSQVARNA FX 350 2020",
"HUSQVARNA FX 350 2021",
"HUSQVARNA FX 350 2022",
"HUSQVARNA FX 450 2019",
"HUSQVARNA FX 450 2020",
"HUSQVARNA FX 450 2021",
"HUSQVARNA FX 450 2022",
"GASGAS EX 350F 2021",
"GASGAS EX 350F 2022",
"GASGAS EX 350F 2023",
"GASGAS EX 450F 2021",
"GASGAS EX 450F 2022",
"GASGAS EX 450F 2023",
"GASGAS MC 350F 2023",
"GASGAS MC 450F 2021",
"GASGAS MC 450F 2022",
"GASGAS MC 450F 2023"
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.
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 12 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.
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.
I was really hoping for this lever to help my 4 year old on his stacyc and it made a huge difference. Closer to the bars, easier for him to squeeze as he is 4 and all around great lever. Super happy with the purchase.