Arrow Thunder Aluminium Approved Silencer – Aprilia RS4 125 (2011-2016)
$538.00
$657.00
-18%
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Arrow Thunder Aluminium Approved Silencer – Aprilia RS4 125 (2011-2016)
$538.00
$657.00
-18%
Taxes included.
Shipping calculated at checkout.
Codice: 51509AO
Pickup available at Moon Bike S.r.l.
Usually ready in 1 hour
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.
Domande frequenti
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Garanzia e originalità +
Tutti i prodotti hanno garanzia legale di 24 mesi. Siamo Rivenditore Ufficiale Piaggio Group: i ricambi originali sono certificati con codice OEM verificabile.
Assistenza tecnica +
Il nostro team tecnico è disponibile via WhatsApp +39 392 456 1248 Lun-Ven 9:00–13:30 / 14:30–18:00, oppure via email.