Customer Service (503) 832-7336
The Only Place For People Who Ride


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Free standard shipping on orders over $149
We ship to the lower 48 United States. Orders over $149 ship free; a flat rate applies under $149. Estimated delivery dates are shown at checkout based on item availability and the shipping option you choose.
We text or call to confirm sizing & fitment before we ship.
Every Factory SuperBike order includes a free expert check from real riders. Before we ship helmets and gear, we text or call to confirm your size and fit; for parts, we verify fitment to your bike. This is why we don't have to guess and you don't have to gamble.
Helmet & gear orders: reply to our text to confirm and your order ships, typically same day. No reply within 48 hours and we'll call you. Questions now? Call or text (503) 832-7336.
The Yoshimura RS-4 Slip-On is a bolt-on muffler with a stainless steel midpipe, an aluminum canister and a carbon fiber end cap.
A slip-on is the cheapest real change available on an off-road four-stroke. It will not transform the power curve the way a full system does — the header is doing that work — but it takes weight off the tail of the bike, gives the engine a voice, and does it for a fraction of the cost and in a fraction of the time.
On the RS-4 the canister is aluminum and the core is repackable, which matters more off-road than on: dirt bikes live at high rpm and burn packing out faster than any street machine.
Confirm fitment before ordering. This listing arrived from the distributor feed without a verified application, and we will not publish a make, model and year range we cannot stand behind. Check part number 961-3411 against Yoshimura's application chart, or contact us and we will confirm it for your bike. Check the sound and spark arrester requirements for the land you ride.
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