Arrow Thunder Aluminium Slip-On Silencer Yamaha YZF-R3 (2015-2018) 71831AK

At just 1.93 kg, the Arrow Thunder slip-on in aluminium transforms the Yamaha YZF-R3 into a sharper, more responsive machine without sacrificing everyday usability. The combination of a lightweight aluminium canister, carbon end cap and stainless steel internals delivers a sporting soundtrack and cleaner throttle response — all while retaining full road approval through its E-mark homologation and included dB killer.

Key Features

• Weighs only 1.93 kg — the reduced unsprung and rotational mass sharpens throttle response and lightens the tail for a more agile feel on long rides and commutes alike.
• Aluminium canister construction offers excellent heat resistance and long-term durability without the weight penalty of steel alternatives.
• Carbon end cap provides a race-inspired finish that complements the YZF-R3's aggressive styling while adding further weight savings at the silencer tip.
• Stainless steel internal components resist corrosion and maintain consistent flow characteristics over the life of the exhaust.
• E-mark approval and removable dB killer keep the system street-legal straight out of the box — remove the dB killer for track days when regulations allow.
• Direct slip-on fitment onto the existing mid-pipe means no specialist tools or re-mapping are required for installation.

Performance on the Road

The Arrow Thunder is engineered to free up the mid-range and top-end character that Yamaha's 321 cc parallel-twin already hints at in standard trim. With a 45 mm inlet and 45 mm outlet diameter and a canister length of 250 mm, the exhaust geometry is optimised for the YZF-R3's power delivery rather than simply being a cosmetic swap. The result is a crisper response off the throttle and a deeper, more characterful note that makes every ride — whether a morning commute or a weekend blast — noticeably more engaging.

Build Quality & Finish

Arrow's Thunder series sits at the sweet spot between everyday practicality and genuine performance engineering. The aluminium body is finished to a high standard and resists road debris and weather far better than a purely cosmetic aftermarket can. The carbon fibre end cap is not a cosmetic decal or wrap — it is a genuine structural component that contributes to the overall weight figure and provides an unmistakably premium look. Inside, the stainless steel packing and baffles are built to last the life of the motorcycle.

Fitment & Compatibility

This silencer is designed as a direct replacement slip-on for the following motorcycle:

• Yamaha YZF-R3 — model years 2015, 2016, 2017 and 2018

The system connects to the standard mid-pipe via the 45 mm inlet connection. No modifications to the headers or airbox are required. As always, verify your specific model year and variant against the Arrow fitment guide before ordering.

Specifications