Arrow Stainless Steel Header BMW M1000RR K66 (2021-2026) 71718MI

Engineered exclusively for the BMW M1000RR K66, the Arrow 71718MI stainless steel header represents Italian exhaust craft at its most purposeful. Every curve of its polished construction carries the heritage of Arrow's decades on the world's most demanding circuits, delivering a foundation that transforms the M1000RR's already formidable power delivery into something noticeably sharper and more responsive.

Key Features

• Precision-engineered stainless steel construction for outstanding heat resistance, durability and a finish that ages with dignity under race conditions.
• Optimised throttle response: the header's internal geometry sharpens fuelling pick-up throughout the rev range, most noticeably on the exit of slow to medium-speed corners.
• 60 mm outlet diameter engineered to flow freely into Arrow slip-on silencers (71506 or 71903) or the original BMW end can.
• Significant weight saving over the stock system at 3.10 kg, contributing to a more agile front-end feel on the brakes and through direction changes.
• Designed specifically for track use, making it the natural choice for race builds, track-day machines and competition preparation.
• ECU remapping strongly recommended to extract the full performance gain and protect engine longevity.

Design, Finish and Heritage

Arrow has been supplying headers to World Superbike and MotoGP teams for decades, and the 71718MI carries that lineage directly to the M1000RR owner who demands more than a bolt-on part. The stainless steel finish is purposefully industrial — raw, heat-tinted and honest — in the way that serious race components always are. There are no cosmetic compromises here: the material choice is driven entirely by the need to survive repeated full-throttle sessions without distortion, cracking or corrosion.

The 60 mm outlet is machined to Arrow's exacting tolerances, ensuring a leak-free, rattle-free join whether you mate it to the factory slip-on or step up to an Arrow carbon or titanium end can. The result is a system that looks as cohesive as it performs.

Performance on Track

The M1000RR K66 already sits at the very top of the superbike class in stock trim. The 71718MI header takes that platform further by reducing exhaust backpressure, sharpening throttle pick-up on corner exit and allowing the engine to breathe more freely at the top of the rev range. When paired with a bespoke ECU map — which Arrow strongly advises — the improvement in both peak output and mid-range delivery is tangible. This is a component for riders who use their M1000RR the way BMW intended: hard, fast and on track.

Fitment and Compatibility

The Arrow 71718MI header is a direct, purpose-built fitment for the following motorcycle:

• BMW M1000RR, engine code K66, model years 2021 to 2026

Compatible end cans:

• Arrow slip-on silencer 71506
• Arrow slip-on silencer 71903
• Original BMW factory slip-on silencer

Race use only. This header is not road-legal and carries no type approval for use on public roads. Fitment must comply with applicable circuit and series regulations. ECU remapping is strongly recommended following installation.

Specifications