Arrow Pro-Race Slip-On Silencer Dark Stainless Steel BMW M1000RR K66 (2021-2026) 71903PRN

The Arrow Pro-Race 71903PRN delivers a genuinely satisfying riding experience from the first bolt-up, combining a dark stainless steel finish with a featherlight 1.72 kg construction that transforms the feel of the BMW M1000RR on both road and circuit. Engineered specifically for the K66 generation, this slip-on slots into place with a clean plug-and-play fit that makes every commute and canyon run feel just as rewarding as a track day.

Key Features

• Road-legal E-marked approval means the Pro-Race can be used daily without compromise or paperwork headaches.
• At just 1.72 kg, the silencer shaves meaningful unsprung and overall weight for sharper turn-in and more responsive handling.
• Dark stainless steel canister, stainless end cap and stainless internals deliver long-term corrosion resistance alongside a purposeful, race-inspired aesthetic.
• Removable dB killer reduces noise for road use and can be extracted in seconds for unrestricted track sessions.
• Total length of 250 mm with a 60 mm inlet and 68 mm outlet ensures a precise, rattle-free connection to the standard header.
• Fully compatible with Arrow headers — bolt on a matching Arrow collector and the system becomes a complete exhaust setup to maximise throttle response and peak output.

Build Quality and Performance

Arrow has built the Pro-Race around a dark stainless steel outer canister that resists heat discolouration and road grime far better than a polished or titanium alternative. The stainless internals and end cap maintain structural integrity at prolonged high temperatures, so the silencer ages gracefully whether it sees motorway miles or back-to-back track sessions. The slim 250 mm profile tucks neatly under the tail unit, preserving ground clearance and cornering angle without sacrificing the visual aggression the M1000RR deserves.

Road and Track Use

For road riders, the included dB killer keeps the note cultured enough for daily use while still producing the deep, purposeful exhaust tone that distinguishes an Arrow-equipped BMW from stock. Remove it at the circuit and the Pro-Race opens up fully, rewarding the M1000RR's high-revving inline-four with a sound and character that matches the bike's race-derived engine architecture. Arrow recommends a bespoke ECU mapping when pairing this silencer with Arrow headers to extract maximum throttle response and durability from the full system.

Image Note

The product image shows a BMW S1000RR for reference purposes, as Arrow has not yet released official photography of the silencer fitted to the M1000RR. The part number, fitment data and all specifications apply specifically to the M1000RR K66.

Fitment and Compatibility

• BMW M1000RR K66 — model years 2021, 2022, 2023, 2024, 2025, 2026
• Part number: 71903PRN
• Connects directly to the OEM header without modification; Arrow headers recommended for a complete system upgrade

Specifications