Arrow Pro-Race 71903PRI stainless steel slip-on silencer for BMW M1000RR K66
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1.72 k g
02 · Data & docs

The facts.

Technical data
Part Number71903PRI
TypeSlip-on silencer
Material — canisterStainless steel
Material — end capStainless steel
Material — internalsStainless steel
Weight1.72 kg
Silencer length250 mm
Inlet diameter60 mm
Outlet diameter68 mm
Road homologationE-number approved
DescriptionThe whole story▼

The Arrow Pro-Race 71903PRI is a road-legal stainless steel slip-on silencer built specifically for the BMW M1000RR K66 (2021-2026). Weighing just 1.72 kg, it delivers sharper throttle response and a more purposeful exhaust note on every ride — with an E-number homologation and removable dB killer so you stay legal without compromise.

Key Features

  • Full stainless steel construction throughout — canister, end cap and internals — for exceptional corrosion resistance and long service life, even in all-weather use.
  • At only 1.72 kg, the lightweight build reduces unsprung mass and sharpens throttle response compared to the heavier OEM silencer.
  • E-number road homologation included: the silencer is fully street-legal straight out of the box.
  • Integrated dB killer manages sound levels to meet road-use regulations without noticeably blunting performance.
  • Designed to pair with an Arrow header to form a complete exhaust system, unlocking further power gains when combined.
  • Optimised 250 mm canister length with a 60 mm inlet and 68 mm outlet for efficient gas flow and consistent power delivery.

Everyday Usability and Long-Term Value

Unlike track-only systems that demand decat pipes and ECU flashes just to pass an MOT, the Arrow Pro-Race 71903PRI is engineered for the rider who wants measurable improvement on the road without the hassle. The stainless steel body resists the grime and moisture of daily use, and the included dB killer means you can run it to work, to the track day briefing, and home again without touching a thing. When you are ready to explore further, simply remove the dB killer and pair the silencer with an Arrow header to release the full Pro-Race character of the system.

Arrow recommends a dedicated ECU mapping session once the silencer is fitted to ensure fuelling is optimised for the BMW M1000RR's engine characteristics. This single step is the most cost-effective way to get every last benefit from the upgrade.

Please note: product images currently show a BMW S1000RR, as Arrow has not yet released dedicated photography for the M1000RR variant. The silencer 71903PRI is engineered and optimised exclusively for the BMW M1000RR K66 (2021-2026).

Fitment and Compatibility

  • BMW M1000RR K66 — model years 2021, 2022, 2023, 2024, 2025, 2026
  • Slip-on fitment: connects directly to the existing OEM header or to an Arrow replacement header
  • Compatible with Arrow header for full-system conversion

Specifications

Part Number 71903PRI
Type Slip-on silencer
Material — canister Stainless steel
Material — end cap Stainless steel
Material — internals Stainless steel
Weight 1.72 kg
Silencer length 250 mm
Inlet diameter 60 mm
Outlet diameter 68 mm
Road homologation E-number approved
dB killer Included
Fitment BMW M1000RR K66 (2021-2026)
FitmentWhich bikes this fits▼
  • BMW M1000RR K66 (2021–2026)
07 · Support

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08 · Paddock

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