Ride farther, ride longer, and ride legal with the FMF Q4 HEX Slip-On Exhaust for your Kawasaki KX 450, X, or SR (2019–2023). Built to meet USFS and FIM World Enduro sound requirements, the Q4 combines stealthy sound control with proven power gains across the RPM range. It's FMF’s most advanced quiet system—lightweight, durable, and designed for real off-road use.
Key Features
Low Sound, High Output: Reduces noise while increasing horsepower and torque.
USFS Approved: Includes spark arrestor and meets strict noise regulations.
Durable Off-Road Build: Stainless steel midpipe and endcap resist abuse on rugged trails.
Lightweight Construction: Aluminum canister keeps weight down to just 5.5 lbs.
Easy Compatibility: Fits stock or FMF headers—bolt-on performance, no hassle.
Made in the USA: 100% built in FMF’s California factory.
Specifications
Fitment: Kawasaki KX 450 / X / SR (2019–2023)
Item ID: 042368
Type: Slip-On
Construction: Aluminum canister
Midpipe: Stainless steel
End Cap: Stainless steel
Spark Arrestor: Screen insert included
Quiet Insert: Included
Weight: 5.5 lbs.
Use: Closed Course Only
Go quiet without giving up performance—the FMF Q4 HEX is your go-to for sound-sensitive rides and all-day off-road endurance.
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 13 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.
