Arrow Race-Tech Aluminium Slip-On Silencer BMW S1000RR K67 (2019-2026) 71903AK

Engineered exclusively for the BMW S1000RR K67, the Arrow Race-Tech 71903AK slip-on silencer delivers a seamless blend of road-legal practicality and genuine track-bred performance. Weighing just 2.93 kg, it sheds meaningful mass over the stock unit and slots straight onto your existing headers with no fuss — making it just as rewarding for a long motorway run as it is for a full-throttle lap day.

Key Features

• E-marked and road legal: full homologation for unrestricted road use straight out of the box.
• Aluminium silencer body: lightweight, heat-resistant and finished to a sporting standard that suits the S1000RR's aggressive styling.
• Carbon end cap: adds structural rigidity while giving the exit a premium, race-derived look.
• Stainless steel internals: maximise corrosion resistance and long-term durability, season after season.
• Removable dB killer: included for compliant road riding; pull it out for track days when you want the full exhaust note.
• Plug-and-play fitment: designed to bolt directly onto the OEM header for a straightforward installation with no cutting or fabrication required.
• Full-system upgrade path: compatible with Arrow headers to create a complete Arrow exhaust system for maximum power and throttle response gains.

Build Quality and Performance

Arrow has built the 71903AK around a high-grade aluminium canister that keeps weight low without sacrificing structural integrity under sustained high-heat conditions. The carbon fibre end cap is not merely decorative — it resists heat and vibration at the silencer exit where temperatures are highest. Inside, the stainless steel packing and baffling are engineered to optimise gas flow for the S1000RR's four-cylinder engine, improving mid-range punch and top-end delivery over the factory unit. The inlet diameter of 60 mm and outlet of 50 mm are matched to the BMW's exhaust port dimensions for a gas-tight, rattle-free connection.

Road and Track Use

The included dB killer brings sound levels into line with typical noise regulations for road riding and track-day noise limits, while its tool-free removal takes seconds when the circuit gates open. Arrow recommends a custom ECU remap after fitting to unlock the full performance potential and optimise throttle response across the rev range — particularly worthwhile if you plan to pair this silencer with an Arrow header for a full-system setup.

Note: the product image shown is a digitally rendered representation; an official Arrow product photograph for part number 71903AK was not available at time of listing.

Fitment and Compatibility

• BMW S1000RR (K67) — model years 2019, 2020, 2021, 2022, 2023, 2024, 2025, 2026
• Compatible with Arrow headers for full-system configuration

Specifications