⟲ 360° — drag meThe facts.
| Brand | Arrow |
|---|---|
| Part number | 71903PR |
| Type | Slip-on silencer |
| Material | Titanium |
| Weight | 1.22 kg |
| Silencer length | 250 mm |
| Inlet diameter | 60 mm |
| Outlet diameter | 68 mm |
| Road approval | E-number approved, DB-killer included |
| Fitment | BMW M1000RR K66 (2021-2026) |
DescriptionThe whole story▼
Road-legal and race-ready in equal measure, the Arrow Pro-Race Titanium slip-on silencer for the BMW M1000RR K66 carries a full E-number type approval so it passes scrutineering on the street without compromise. At just 1.22 kg — achieved through an all-titanium construction from inlet to end cap — it shaves meaningful unsprung and overall mass from the tail of one of BMW's most focused superbikes, sharpening throttle response and reducing rotational inertia where it matters most.
Key Features
- E-number road approval and integrated DB-killer for legal street use, removable when regulations permit for a freer exhaust note on track.
- Full titanium construction throughout — body, end cap, inner components — combining exceptional corrosion resistance with minimal weight for long-term durability.
- 1.22 kg total weight delivers a tangible reduction over the stock unit, contributing to improved throttle response and a more dynamic ride feel.
- 60 mm inlet and 68 mm outlet diameters optimise exhaust flow for the M1000RR's high-revving inline-four.
- 250 mm silencer length, precision-engineered for the K66 chassis geometry — no modification required for a clean, factory-quality fitment.
- Directly compatible with Arrow headers to form a complete Arrow exhaust system, unlocking further performance gains when combined with a dedicated ECU remap.
Build Quality and Performance
Arrow's Pro-Race line sits at the top of the Italian manufacturer's road and track hierarchy. Every component of the 71903PR is fabricated in titanium — a material chosen not merely for its weight advantage but for its ability to withstand the extreme thermal cycling that the M1000RR's engine generates at race pace. The result is a silencer that resists discolouration, corrosion and fatigue far beyond what stainless steel or aluminium alternatives can offer over a sustained period of hard use.
The integrated DB-killer is engineered to keep sound levels within legal limits without introducing a restrictive baffle that would blunt mid-range delivery. Riders who upgrade to an Arrow header simultaneously and commission a bespoke ECU remap will find the full system transforms the M1000RR's power curve, with improved fuelling and a broader, more linear torque spread.
Image Note
Product photography currently shows a BMW S1000RR, as Arrow has not yet released dedicated imagery for the M1000RR. The silencer shown is geometrically and aesthetically identical to part number 71903PR; fitment and specification for the BMW M1000RR K66 (2021-2026) are exactly as described.
Fitment and Compatibility
- BMW M1000RR — chassis code K66, model years 2021, 2022, 2023, 2024, 2025, 2026
- Compatible with Arrow headers for full-system configuration
Specifications
| Attribute | Detail |
|---|---|
| Part number | 71903PR |
| Weight | 1.22 kg |
| Material | Titanium (body, end cap, inner components) |
| Silencer length | 250 mm |
| Inlet diameter | 60 mm |
| Outlet diameter | 68 mm |
| Road approval | E-number approved, DB-killer included |
| Fitment | BMW M1000RR K66 (2021-2026) |
FitmentWhich bikes this fits▼
- BMW M1000RR K66 (2021–2026)
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