Arrow Indy Race Carbon Slip-On Silencer – Aprilia RS 660 (2020–2024) 71929MK

The Arrow 71929MK Indy Race slip-on silencer is a practical, road-legal upgrade for the Aprilia RS 660 that delivers a genuine performance return alongside the distinctive Arrow exhaust note — all without leaving the public road. At just 1.93 kg, the carbon-bodied canister trims meaningful mass from the tail of the RS 660 while the Euro 5 E-number approval keeps you on the right side of any roadside check.

Key Features

• Euro 5 road-legal approval with E-number — fully compliant for everyday street use
• Weighs only 1.93 kg for a noticeable weight reduction over the standard silencer
• Carbon outer canister and carbon end cap with stainless steel internals for lasting durability
• DB killer included for reduced noise levels when required
• Straightforward plug-and-play fitment — no specialist tools or fabrication needed
• Compatible with Arrow header 71755 to build a complete Arrow exhaust system

Build Quality & Materials

Arrow constructs the 71929MK canister from a carbon fibre outer shell paired with a matching carbon end cap, giving the RS 660 a clean, race-influenced finish that also keeps weight to a minimum. The internal components are manufactured from stainless steel, ensuring the silencer resists the heat cycles and corrosion that come with year-round road riding. The combination of these two materials is a deliberate choice: carbon where mass reduction matters most, stainless steel where thermal endurance and structural integrity are critical.

Performance & Everyday Usability

Replacing the stock silencer with the 71929MK sharpens throttle response and improves both power and torque delivery across the rev range. When paired with Arrow header 71755, the gains become more pronounced, as the matched pipe and silencer work together to optimise exhaust gas flow throughout the entire system. Arrow recommends a dedicated ECU mapping session when running the silencer — particularly when combined with the full Arrow header — to get the most from the system and protect engine longevity. For riders who want the Arrow sound and weight saving on a daily basis, the included DB killer provides a simple means of managing noise output.

Fitment & Compatibility

The Arrow 71929MK is engineered specifically for the Aprilia RS 660 covering model years 2020 to 2024. It is a slip-on unit and requires an Arrow-compatible header to complete the exhaust system; Arrow header part number 71755 is the recommended matching header. The 54 mm inlet diameter and 58 mm outlet diameter are fixed — confirm your header outlet dimension before ordering.

Specifications

• Part number: 71929MK
• Weight: 1.93 kg
• Silencer length: 270 mm
• Inlet diameter: 54 mm
• Outlet diameter: 58 mm
• Outer canister material: carbon fibre
• End cap material: carbon fibre
• Internal components: stainless steel
• Approval: Euro 5 (E-number)
• DB killer: included
• Compatible header: Arrow 71755