Arrow 52509AON Thunder Aluminium Dark Silencer Steel End Cap Approved – Aprilia RX/SX 125, UM DSR EX 125, Malaguti XTM/XSM 125
€286,90
€372,88
-23%
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Arrow 52509AON Thunder Aluminium Dark Silencer Steel End Cap Approved – Aprilia RX/SX 125, UM DSR EX 125, Malaguti XTM/XSM 125
€286,90
€372,88
-23%
Taxes included.
Shipping calculated at checkout.
Code: 52509AON
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The Arrow Thunder Dark aluminum exhaust (code 52509AON) is an ECE approved slip-on exhaust with a dark aluminum body and stainless steel end cap, designed for Aprilia RX/SX 125 (2018-2020), Malaguti XTM/XSM 125 4T (2019-2020) and UM DSR EX 125 (2018-2020). Produced in Italy by Arrow with TIG welding and premium materials, it offers a deeper, more engaging sound than the original exhaust, while maintaining full road legality thanks to ECE R92.01 Euro 4 approval.
✓ Strengths
- ECE R92.01 – Euro 4 approved – 100% legal on public roads (mounted on original header)
- Dark aluminum body – lightweight, heat resistant, and aggressive look
- Stainless steel end cap – long-lasting durability and elegant finish
- Weight only 2.43 kg – significant weight saving compared to the original
- Removable DB-Killer – included and welded, removable for track use (Arrow provides replacement)
- TIG welds – high-quality Made in Italy craftsmanship
- Slip-on mounting – installs on the original header, no structural modifications
Technical specifications
| Brand | Arrow |
| Model | Thunder |
| Code | 52509AON |
| Type | Slip-on muffler |
| Body material | Dark Aluminum |
| Internal material | Stainless steel |
| Link pipe material | Stainless steel |
| End cap material | Stainless steel |
| Body length | 350 mm |
| Inlet diameter | 36 mm |
| Outlet diameter | 40 mm |
| Weight | 2.43 kg |
| DB-Killer | Yes (welded, removable) |
| Lambda sensor | No |
| CO sensor | No |
| Approval | ECE R92.01 (ECE-ONU) – Euro 4 |
| Production | Made in Italy |
⚠️ Important notes on approval and mounting:
• This muffler is ECE approved for noise and power (Euro 4) when mounted on the bike's original header.
• If you replace the header with an Arrow racing header (e.g., 52001PD), the exhaust loses CO2 emission approval as the catalytic converter is in the original header.
• To maintain full Euro 4 approval with an Arrow header, the Arrow 52001PZ approved catalytic header is required.
• The DB-Killer is mandatory for public road use.
• This muffler is ECE approved for noise and power (Euro 4) when mounted on the bike's original header.
• If you replace the header with an Arrow racing header (e.g., 52001PD), the exhaust loses CO2 emission approval as the catalytic converter is in the original header.
• To maintain full Euro 4 approval with an Arrow header, the Arrow 52001PZ approved catalytic header is required.
• The DB-Killer is mandatory for public road use.
Vehicle compatibility
| Brand | Model | Years |
|---|---|---|
| Aprilia | RX 125 (4T) | 2018 – 2020 |
| Aprilia | SX 125 (4T) | 2018 – 2020 |
| Malaguti | XTM 125 4T | 2019 – 2020 |
| Malaguti | XSM 125 4T | 2019 – 2020 |
| UM Moto | DSR EX 125 | 2018 – 2020 |
Recommended / necessary products
- Arrow 52001PD racing header – for maximum performance (NOT emission approved, track use only)
- Arrow 52001PZ approved catalytic header – for road use with full Euro 4 approval even without the original header
- Arrow replacement DB-Killer – in case of loss or damage
Who it's perfect for
The Arrow Thunder Dark exhaust is the ideal choice for Aprilia RX or SX 125, Malaguti XTM/XSM 125, or UM DSR EX 125 owners looking for an exhaust upgrade with a more assertive sound, reduced weight, and an aggressive dark aluminum look, all while maintaining full road legality. Perfect for both daily road use and light off-road riding.
🛡️ Warranty and quality
100% original Arrow product, Made in Italy. Moon Bike S.r.l. is an authorized Arrow dealer based in Cercola (NA). All our Arrow exhausts are covered by the manufacturer's warranty and comply with current European regulations.
100% original Arrow product, Made in Italy. Moon Bike S.r.l. is an authorized Arrow dealer based in Cercola (NA). All our Arrow exhausts are covered by the manufacturer's warranty and comply with current European regulations.
Compatible vehicles
- Aprilia RX 125 4T (2018-2020)
- Aprilia SX 125 (2018-2020)
Not sure it fits? Contact us
Frequently asked questions
Shipping times +
Shipping within 24-48 working hours in Italy. Tracking via SMS/email. Free pickup at our store in Cercola (NA), ready within 1 hour.
Returns and refunds +
You have 14 days from delivery to return the item without giving a reason. Free returns for faulty items. Full details
Payment methods +
Credit cards (Visa, Mastercard, American Express), PayPal, Apple Pay, Google Pay, Shop Pay, Klarna (pay in 3) and cash on delivery.
Warranty and authenticity +
All products come with a 24-month legal warranty. We are an Official Piaggio Group Dealer: original spare parts are certified with a verifiable OEM code.
Technical support +
Our technical team is available on WhatsApp +39 392 456 1248 Mon-Fri 9:00–13:30 / 14:30–18:00 (Italian time), or by email.