Arrow Thunder Aluminium Approved Silencer – Aprilia RS4 125 (2011-2016)
$445.00
$616.00
-27%
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Arrow Thunder Aluminium Approved Silencer – Aprilia RS4 125 (2011-2016)
$445.00
$616.00
-27%
Taxes included.
Shipping calculated at checkout.
Code: 51509AO
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This order ships outside the European Union and is subject to customs clearance in the destination country.
Export formalities and costs from Italy are on us and are already included in the price.
Import duties, taxes and clearance fees in the destination country are payable by the buyer. They are not included in the product price or the shipping cost, and we cannot calculate them: they are set by the customs authority of the destination country.
The carrier will not release the parcel until the recipient pays these charges. If the shipment is refused or the charges are left unpaid, the parcel is returned to us and shipping, return and any customs costs are deducted from the refund.
This order ships outside the European Union and is subject to customs clearance in the destination country.
Export formalities and costs from Italy are on us and are already included in the price.
Import duties, taxes and clearance fees in the destination country are payable by the buyer. They are not included in the product price or the shipping cost, and we cannot calculate them: they are set by the customs authority of the destination country.
The carrier will not release the parcel until the recipient pays these charges. If the shipment is refused or the charges are left unpaid, the parcel is returned to us and shipping, return and any customs costs are deducted from the refund.
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The Arrow Thunder aluminum silencer (code 51509AO) is an approved slip-on exhaust designed for the Aprilia RS4 125 (2011-2016). It mounts directly onto the original headers without any modifications, offering increased performance, significant weight reduction, and a more engaging sound. Produced entirely in Italy by Arrow Special Parts, official technical partner of Aprilia.
✓ Strengths
- E9 approved according to European directive 97/24/CE chapter 9 (with catalytic converter 11013KZ)
- Aluminum body with stainless steel end cap — lightness and corrosion resistance
- +2.00 HP power and +1.18 Nm torque compared to the original exhaust
- -2.70 kg weight compared to the stock silencer
- DB Killer included and removable
- Plug & play installation on original headers, no modifications needed
- Made in Italy — Arrow Special Parts, official technical partner of Aprilia
Technical specifications
| Brand | Arrow Special Parts |
| Model | Thunder Aluminum |
| Product code | 51509AO |
| Type | Slip-on silencer for original headers |
| Approval | E9 — Directive 97/24/CE chapter 9 (only with catalytic converter 11013KZ) |
| Body material | Aluminum |
| Rear end cap material | Stainless steel |
| Silencer inner material | Stainless steel |
| Header material | Stainless steel (original headers) |
| Frame mounting | Welded bracket |
| Body length | 350 mm |
| Inlet diameter | 36 mm |
| Outlet diameter | 50 mm |
| DB Killer | Yes, included and removable |
| Silencer weight | 2.90 – 3.00 kg |
Performance data (on original headers)
| Parameter | Value |
|---|---|
| Power increase | +2.00 HP |
| Torque increase | +1.18 Nm |
| Weight reduction | -2.70 kg compared to original |
| Static noise | +2 dB compared to original |
⚠️ Important notes:
• Approval is ONLY valid with the Arrow 11013KZ catalytic converter present (sold separately). Without a catalytic converter, the silencer is NOT approved for road use.
• The silencer mounts on the original Aprilia headers, no modifications to the frame or system are necessary.
• Mounting kit included in the package.
• Homologation certificate included, to be attached to the motorcycle registration document.
• Not compatible with Aprilia RS4 125 from 2017 onwards (they require different codes).
• Approval is ONLY valid with the Arrow 11013KZ catalytic converter present (sold separately). Without a catalytic converter, the silencer is NOT approved for road use.
• The silencer mounts on the original Aprilia headers, no modifications to the frame or system are necessary.
• Mounting kit included in the package.
• Homologation certificate included, to be attached to the motorcycle registration document.
• Not compatible with Aprilia RS4 125 from 2017 onwards (they require different codes).
Vehicle compatibility
| Make | Model | Engine type | Years |
|---|---|---|---|
| Aprilia | RS4 125 | TW | 2011 – 2016 |
Required and recommended products
- 🔴 REQUIRED for approval: Arrow Catalytic converter 11013KZ — mandatory to make the silencer road-approved
- Recommended: Arrow racing link pipe 51013MI — as an alternative to the catalytic converter for racing/track use (NOT approved)
Who it's perfect for
The Arrow Thunder Aluminum silencer is the ideal choice for Aprilia RS4 125 owners who want to improve their bike's performance and sound while remaining compliant with road homologation. Perfect for those looking for a lightweight silencer with an aggressive design and a brand recognized in the world of competitions. Also ideal as a first upgrade for new riders with A1 motorcycles.
🛡️ Warranty and quality
Original Arrow Special Parts product, Made in Italy. Moon Bike S.r.l. is an authorized Arrow dealer based in Cercola (NA). All Arrow exhausts are covered by the manufacturer's warranty and comply with current European regulations.
Original Arrow Special Parts product, Made in Italy. Moon Bike S.r.l. is an authorized Arrow dealer based in Cercola (NA). All Arrow exhausts are covered by the manufacturer's warranty and comply with current European regulations.
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.