Arrow Thunder Slip-On Silencer Aluminium Dark – Yamaha YZF-R3 (2021-2026) 71831AKN

The Arrow Thunder 71831AKN is the silencer that earns its place on sight before you even start the engine. Finished in Arrow's signature dark-anodised aluminium with a carbon end cap, it carries the unmistakable aesthetic DNA of Arrow's racing heritage — refined, purposeful and distinctly Italian — while trimming meaningful weight from the tail of your Yamaha YZF-R3.

Key Features

• Dark-anodised aluminium canister paired with a carbon end cap: a finish combination that ages gracefully and stands apart from polished or steel alternatives.
• Weighs just 1.93 kg — a genuine weight saving over the stock unit that sharpens throttle response and lightens the back end.
• E-number road approval means the Thunder is fully street-legal straight out of the box, no paperwork headaches.
• Removable dB killer included for sound-level compliance on the road, with the option to extract it for track days when regulations allow.
• Stainless steel internals resist corrosion and maintain consistent back-pressure across the service life of the silencer.
• Compact 250 mm canister length keeps mass centralised and preserves ground clearance on spirited cornering.
• Arrow recommends pairing with a dedicated fuel mapping for the YZF-R3 to unlock the full performance potential of the freer-flowing exhaust.

Design, Finish and Heritage

Arrow has been producing exhaust systems for MotoGP, WorldSBK and World Supersport machinery for decades, and the Thunder line channels that track experience into a street-ready package. The dark aluminium finish is not a coating applied over bare metal — it is an inherent part of the treated alloy surface, giving it resistance to heat discolouration and the kind of durability that survives daily commutes as comfortably as Sunday-morning canyon runs.

The carbon end cap reinforces the sporting intent without tipping into excess. Against the matte dark body of the canister it reads as deliberate and restrained — exactly the tone that suits the YZF-R3's character as a bike that takes corners seriously. The 45 mm inlet and outlet diameters are matched to the R3's mid-range power delivery, encouraging a broader, more responsive throttle feel across the rev range rather than chasing a single peak figure.

Road and Track Versatility

With its E-number homologation the Thunder passes technical inspection at track days that require road-legal exhausts, and the dB killer keeps noise readings within statutory limits for everyday riding. Removing the dB killer for open-circuit sessions is straightforward, letting the characteristic Arrow note come through cleanly. The stainless steel internals hold up to the repeated heat cycles that track use demands, while the overall 1.93 kg assembly weight means you are not adding back what you saved at the back of the bike.

Fitment and Compatibility

The Arrow Thunder 71831AKN is a direct-fit slip-on silencer designed exclusively for the following motorcycle:

• Yamaha YZF-R3 — model years 2021, 2022, 2023, 2024, 2025 and 2026

The silencer connects to the standard mid-pipe; no modification to the header or subframe is required for installation. Arrow recommends updating the fuel mapping after fitting to optimise throttle response and power delivery.

Specifications