Arrow Pro-Race Slip-On Silencer Stainless Dark KTM RC 390 (2017-2020) 71860PRN

Street-legal, lightweight and built to last, the Arrow Pro-Race 71860PRN slip-on silencer is a straightforward upgrade for KTM RC 390 owners who want a genuine performance exhaust they can ride every day without compromise. Weighing just 1.43 kg and finished in stainless dark, it delivers sharper throttle response and a more purposeful exhaust note while keeping the RC 390 fully road-legal thanks to its included E-number homologation and removable dB killer.

Key Features

• Weighs only 1.43 kg — a meaningful reduction over the stock silencer that improves handling balance without any trade-off in durability.
• Full stainless steel construction throughout — body, end cap and internals — resists corrosion and high operating temperatures season after season.
• Stainless Dark end cap finish: the darkened heat-treated look adds a purposeful, understated aesthetic that suits the RC 390's aggressive lines.
• Supplied with a removable dB killer so you can run it quietly on the road or open it up on track days without buying separate accessories.
• E-number road approval included — no MOT headaches, no need to swap exhausts before a ride.
• Compatible with the original KTM header or any Arrow header, making it an easy bolt-on with no additional bracketry required.

Performance & Build Quality

Arrow engineered the Pro-Race range to bridge the gap between a purely street silencer and a dedicated race can. The 250 mm body length and 68 mm outlet diameter are sized specifically for the RC 390's engine characteristics, promoting mid-range responsiveness that makes the most of the single-cylinder's torque. Stainless steel internals handle the sustained heat cycles that smaller-displacement engines generate at high revs, and the overall construction is consistent with Arrow's reputation for Italian precision manufacturing.

For riders looking to extract every last gain, Arrow recommends a custom ECU map to complement the freer-flowing exhaust. While the silencer delivers a noticeable improvement over stock even without remapping, a tailored fuel map will sharpen throttle response further and ensure the fuelling remains clean across the rev range.

Fitment & Compatibility

This slip-on is designed exclusively for the KTM RC 390 covering model years 2017 to 2020. It connects directly to the standard KTM header pipe or to any Arrow mid-pipe for the same application. No cutting or modification to the subframe is required for a standard fitment.

• KTM RC 390 — 2017
• KTM RC 390 — 2018
• KTM RC 390 — 2019
• KTM RC 390 — 2020

Specifications