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 Akrapovic Slip-On Line is a bolt-on carbon fibre muffler for the 2023-2026 Kawasaki Ninja ZX-4R and ZX-4RR, hand-crafted in carbon with a titanium end cap.
The ZX-4R is a 399 cc inline four that revs past 15,000 rpm — an engine layout nobody else is building at this displacement, and one that sounds completely unlike the parallel twins it competes against. The factory silencer is sized for noise compliance and hides most of that.
Being EC/ECE type approved, this is the slip-on that gets you the sound and the look without changing the bike's legal standing. Plug-and-play, no remapping.
Fits the 2023-2026 Kawasaki Ninja ZX-4R and ZX-4RR.
If you want the full gain, Akrapovič's Racing Line complete system (S-K2R3-APC) for the same bike replaces the headers and catalyst too — we stock it, and it is closed-course only.
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