⟲ 360° — drag meThe facts.
| Brand | Arrow |
|---|---|
| Part number | 71831AK |
| Type | Slip-on silencer |
| Canister material | Aluminium |
| End-cap material | Carbon |
| Internal material | Stainless steel |
| Weight | 1.93 kg |
| Canister length | 250 mm |
| Inlet diameter | 45 mm |
| Outlet diameter | 45 mm |
DescriptionThe whole story▼
Arrow's Thunder slip-on silencer gives the Yamaha YZF-R3 a genuine edge on track day and in daily riding alike. Tipping the scales at just 1.93 kg in a lightweight aluminium canister, the 71831AK sharpens throttle response and trims unsprung mass where it matters most — letting the R3 rev more freely and carry speed with greater confidence through corners.
Key Features
- Aluminium canister construction keeps weight to 1.93 kg, improving throttle response and overall handling balance.
- Carbon end-cap delivers a motorsport aesthetic while withstanding prolonged heat cycles at the exit of the silencer.
- Stainless steel internals resist corrosion and maintain consistent back-pressure characteristics throughout the product's lifespan.
- Road-legal E-number homologation means the same silencer that works on circuit passes inspection for everyday street use.
- Removable dB killer allows sound levels to be tuned to the track or road environment without permanent modification.
- Dedicated Arrow mapping recommended to optimise fuelling and extract the full performance benefit on the YZF-R3.
Engineering Detail
The Thunder's 250 mm canister is sized specifically for the YZF-R3's mid-range power characteristics. Both the inlet and outlet connections measure 45 mm in diameter, ensuring a clean, unrestricted gas flow path through the system. The aluminium body dissipates heat efficiently and resists the kind of fatigue cracking that can afflict heavier steel alternatives under repeated track use. Arrow's stainless steel internal packing retains its geometry even after prolonged high-rpm sessions, so the silencer performs on the final lap exactly as it did on the first.
Road to Track Versatility
Thanks to its E-number homologation, the 71831AK requires no additional paperwork for road registration in markets that accept E-marked components. The included dB killer keeps sound output within legal limits on public roads. For track days where noise regulations are less restrictive, removing the dB killer allows the Thunder to deliver the open, characterful exhaust note that Arrow is renowned for. Pairing the silencer with Arrow's dedicated fuelling map sharpens throttle response further, making the transition from street to circuit seamless.
Fitment & Compatibility
The Arrow Thunder 71831AK is designed as a direct bolt-on slip-on silencer for the following:
- Yamaha YZF-R3 — model years 2021, 2022, 2023, 2024, 2025, 2026
No additional brackets or adaptors are required. Arrow recommends fitting an appropriate fuelling map after installation to optimise performance.
Specifications
| Attribute | Detail |
|---|---|
| Brand | Arrow |
| Part number | 71831AK |
| Type | Slip-on silencer |
| Canister material | Aluminium |
| End-cap material | Carbon |
| Internal material | Stainless steel |
| Weight | 1.93 kg |
| Canister length | 250 mm |
| Inlet diameter | 45 mm |
| Outlet diameter | 45 mm |
| Road homologation | E-number approved |
| dB killer | Included, removable |
| Fitment | Yamaha YZF-R3 (2021-2026) |
FitmentWhich bikes this fits▼
- Yamaha YZF-R3 (2021–2026)
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