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Arrow Pro-Race Slip-On Kit Stainless Steel – KTM RC 390 (2017-2020) 71860PRI

CHF 436.11

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The Arrow Pro-Race slip-on silencer is one of Italy's most respected exhaust names distilled into a single, purposeful component. Built entirely from stainless steel and weighing just 1.63 kg, the 71860PRI is engineered specifically for the KTM RC 390 (2017–2020) — delivering sharper throttle response, a refined exhaust note, and a finish that looks as good on a sun-drenched mountain road as it does in a paddock garage.

Key Features

  • Full stainless steel construction throughout — canister body, end cap and internal components — for outstanding heat resistance and long-term corrosion protection.
  • Weighs only 1.63 kg, reducing unsprung mass and contributing to improved throttle response and overall ride feel.
  • Compact 250 mm silencer length keeps the profile tight and the centre of gravity low.
  • 68 mm outlet diameter is precisely matched to the KTM RC 390 for an OEM-quality fit with no modification required.
  • Supplied with a removable db killer for full road-legal compliance; E-number approval included.
  • Designed to pair directly with the stock RC 390 header or any Arrow header pipe for a seamless system upgrade.

Design, Finish and Heritage

Arrow has been crafting exhaust systems in Italy since 1969, and the Pro-Race range carries that heritage in every weld. The stainless steel finish ages with character rather than corroding with neglect — the brushed canister develops a warm patina under heat while the stainless end cap holds its lustre indefinitely. This is exhaust design that respects the RC 390's sharp, minimalist aesthetic rather than fighting it.

The Pro-Race name is not decorative. Arrow's engineers apply the same flow-optimised internal geometry used in their full race systems, then add the practical detail that road riders need: the db killer threads in cleanly, reduces the sound level to within legal limits, and comes out in seconds when the road closes and the track opens.

Road and Track Performance

The weight saving over the stock silencer is immediately perceptible at the bars. With less mass cantilevered off the rear of the frame, the RC 390 turns with less effort and holds its line with greater precision. Throttle pick-up from low revs is crisper, and the mid-range pull that makes the RC 390 such a rewarding street bike is noticeably more immediate. Whether commuting, touring mountain passes, or using the RC 390 as a track-day weapon, the 71860PRI delivers a measurable and audible improvement over the original fitment.

Fitment and Compatibility

This slip-on kit is designed exclusively for the KTM RC 390 manufactured between 2017 and 2020. It attaches to the original KTM header pipe or to any Arrow header, making it a natural first step in a staged exhaust build. No ECU remapping is required when used with the standard airbox, though Arrow recommends a fuelling check whenever exhaust systems are changed.

Specifications

  • Brand: Arrow
  • Part number: 71860PRI
  • Type: Slip-on silencer kit
  • Material (canister, end cap, internals): stainless steel
  • Weight: 1.63 kg
  • Silencer length: 250 mm
  • Outlet diameter: 68 mm
  • Road approval: E-number homologation
  • Db killer: included (removable)
  • Fitment: KTM RC 390 (2017–2020)
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