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Arrow Thunder Titanium Slip-On Silencer KTM RC 390 2017-2020 – 71860PK

€483,14

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  • Genuine parts & verified quality
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  • 14-day returns — in stock ships within 24h
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We ship with DHL and FedEx — express on request. If an item is in stock, express delivery can often go out within 1 business day. Standard delivery takes about 2–5 business days domestically and usually around a week worldwide. Please check the available shipping options and delivery times in your cart, as we offer several carriers depending on the country.

Returns must be registered in advance by email and are possible in line with our cancellation policy (14-day return request + 14-day return window after approval). Please note: unregistered returns are not accepted. You'll find all details on conditions, exceptions and refunds in our cancellation policy.

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Road-legal, lightweight and built to last, the Arrow Thunder Titanium slip-on silencer for the KTM RC 390 (2017–2020) carries a full E-number type approval so you can ride with complete confidence on public roads. At just 1.73 kg, the titanium canister sheds meaningful unsprung mass, sharpening throttle response and giving the RC 390 a more urgent, free-revving character without sacrificing compliance.

Key Features

  • E-number road approval and integrated DB-killer ensure the exhaust meets legal noise limits straight out of the box — no guesswork, no risk of failing roadside checks.
  • Titanium outer canister: exceptionally heat-resistant and corrosion-resistant, keeping weight to just 1.73 kg for noticeably crisper throttle response.
  • Carbon end cap adds a race-bred aesthetic while contributing to the minimal overall weight.
  • Stainless steel internals guarantee long-term durability and consistent flow characteristics over the life of the silencer.
  • 270 mm canister length with a 50 mm outlet and 54 mm inlet — dimensions tuned for optimal flow and mid-range punch on the RC 390 platform.
  • Combinable with an Arrow header to build a full Arrow exhaust system for maximum performance gains.

Certification and Road Legality

The 71860PK carries an E-number homologation, confirming it has passed the relevant European type-approval tests for road use. The factory-fitted DB-killer controls sound output to within statutory limits. This makes the Arrow Thunder the responsible choice for riders who want a performance upgrade that remains fully street-legal — no re-mapping or paperwork headaches on an MOT or TÜV inspection.

Build Quality and Materials

Arrow constructs the Thunder canister from aerospace-grade titanium, a material that tolerates sustained high exhaust temperatures without discolouring structurally or losing integrity. The natural heat tint that develops on a titanium can is a mark of quality, not a flaw. Inside, a stainless steel baffle and packing deliver consistent back-pressure characteristics throughout the silencer's service life. The carbon fibre end cap is not merely cosmetic — it resists heat conducted from the canister and is significantly lighter than an equivalent aluminium cap, keeping the rearward weight bias of the RC 390 in check.

Installation Note

The Arrow Thunder 71860PK is a slip-on silencer and requires the Arrow connecting pipe 71667MI for installation. This connecting pipe is sold separately. Once fitted with the appropriate link pipe, the combination can be further upgraded by adding an Arrow header to create a complete Arrow exhaust system.

Fitment and Compatibility

Engineered specifically for the KTM RC 390, model years 2017, 2018, 2019 and 2020. No modification to the stock header or airbox is required when using the recommended connecting pipe 71667MI.

Specifications

  • Part number: 71860PK
  • Fitment: KTM RC 390 (2017–2020)
  • Weight: 1.73 kg
  • Canister length: 270 mm
  • Inlet diameter: 54 mm
  • Outlet diameter: 50 mm
  • Canister material: titanium
  • End cap material: carbon fibre
  • Internal components material: stainless steel
  • Road approval: E-number homologated
  • DB-killer: included (integrated)
  • Connecting pipe required: Arrow 71667MI (sold separately)
More guides on Slip-On Silencers →