Arrow Pro-Race Slip-On Silencer Stainless Steel BMW S1000RR K67 (2019-2026) 71903PRI

Constructed entirely from high-grade stainless steel — silencer body, end caps and internals alike — the Arrow Pro-Race 71903PRI is a slip-on built to the exacting tolerances you expect from a marque that has spent decades at the sharp end of World Superbike. At just 1.72 kg it sheds meaningful mass from the tail of your BMW S1000RR K67, sharpening throttle response and improving weight distribution without a single compromise on longevity or finish quality.

Key Features

• Full stainless steel construction throughout — silencer body, end caps and internals — for outstanding heat resistance, corrosion immunity and a premium brushed finish that ages with the bike rather than against it.
• Weighs only 1.72 kg, contributing a genuine reduction in unsprung and rotational mass for sharper handling and improved power-to-weight feel.
• E-mark road approval included, so the silencer is street-legal straight out of the box for everyday road use.
• Removable dB killer supplied as standard — retain it for commuting compliance or pull it for track days without touching a spanner.
• Plug-and-play fitment engineered specifically for the S1000RR K67 chassis; no fabrication, no adapters, no guesswork.
• Fully compatible with Arrow headers to form a complete exhaust system, unlocking further performance and throttle response gains when paired with dedicated ECU mapping.

Build Quality & Materials

Arrow's decision to specify stainless steel for every component of the 71903PRI — rather than reserving it only for the outer skin — reflects a genuine commitment to durability rather than cost-cutting elsewhere. The inlet diameter measures 60 mm and the outlet 68 mm, and the silencer body spans 250 mm overall. Every weld, bracket and end cap is finished to the same standard, so the unit looks as purposeful under scrutiny as it does from a distance. The stainless construction also means the finish withstands sustained high-temperature cycling better than painted or coated alternatives, keeping the look fresh through road salt, rain and repeated track sessions alike.

Performance & Road Use

On the road the Pro-Race delivers the richer, freer-breathing exhaust note the S1000RR deserves, while the dB killer keeps the sound level within sensible limits for early-morning runs or noise-controlled circuits. Remove it and the character sharpens noticeably. For riders looking to extract every last margin, pairing the 71903PRI with a compatible Arrow header and a dedicated fuelling map is the recommended route to a complete, optimised system — improving throttle response, peak output and mid-range delivery across the rev range.

Fitment & Compatibility

Designed and manufactured exclusively for the BMW S1000RR K67 covering model years 2019 through 2026. Compatible with Arrow headers to build a full exhaust system. No fitment to other models or year ranges is supported without verification.

Specifications

• Part number: 71903PRI
• Brand: Arrow
• Type: Slip-on silencer
• Material: Stainless steel (body, end caps, internals)
• Weight: 1.72 kg
• Overall length: 250 mm
• Inlet diameter: 60 mm
• Outlet diameter: 68 mm
• Approval: E-mark (road legal)
• dB killer: Included, removable
• Fitment: BMW S1000RR K67 (2019-2026)