Arrow 11013KZ Approved Catalyst Kit – Aprilia RS4 125 (2011-2016)
€148,90
€189,98
-21%
Skip to product information
Arrow 11013KZ Approved Catalyst Kit – Aprilia RS4 125 (2011-2016)
€148,90
€189,98
-21%
Taxes included.
Shipping calculated at checkout.
Code: 11013KZ
Available to order — 0 pieces in our warehouse
Same-day dispatch
Order within
and your item ships
Pickup available at Moon Bike S.r.l.
Usually ready in 1 hour
Shipping outside the European Union — duties payable by the recipient
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.
Suggest your price, we'll reply within 24 working hours
The Arrow 11013KZ catalyst kit is the catalytic converter that the Arrow catalog dedicates to the Aprilia RS4 125 produced from 2011 to 2016 (vehicle type TW). It is the component that validates the type-approval of the Arrow system: without a catalyst, the exhaust is not approved for road use. Product code 11013KZ.
✓ Strengths
- It is the part that keeps the bike street-legal – the Arrow catalog warns that the type-approval is only valid with the catalyst present in the system
- Combined in the catalog with the Thunder 51509AO silencer – these are the only two codes on the Arrow page for the RS4 125
- Components interchangeable with the original ones – it is installed in place of the corresponding stock section
- Original Arrow spare part – produced in Italy by Arrow Special Parts
- Unique code for the entire generation – covers the RS4 125 from 2011 to 2016, in all versions
Technical features
| Brand | Arrow Special Parts |
| Product code | 11013KZ |
| Official name | Catalyst kit |
| Spare part type | Catalytic converter |
| Material | Metal – the alloy is not specified by the manufacturer |
| Type-approval | Approved for road use |
| Db-killer | Not provided |
| Lambda probe port | Not provided |
| Position on the vehicle | Catalytic section, between the manifold and the silencer |
| Catalog pairing | Arrow 51509AO aluminum approved Thunder silencer |
| Arrow vehicle type | TW |
| Weight | 0.5 kg (data declared by Arrow) |
| Quantity required per vehicle | 1 piece |
| Country of origin | Italy |
| EAN | 8019799055131 |
| Package contents | 1 catalyst kit |
⚠️ Important notes:
• The catalyst is not a silencer: it does not replace the muffler, but the catalytic section of the system. On its own, it does not change the aesthetics of the exhaust.
• The Arrow system type-approval is only valid with this catalyst installed: this is the warning the catalog provides on the RS4 125 page.
• The price refers to the catalyst only: the Thunder 51509AO silencer is a separate code and is sold separately.
• Arrow does not publish dimensions or the alloy of this item: before purchasing, compare the code with the assembly diagram of your system.
• Installation by qualified personnel is recommended.
• The catalyst is not a silencer: it does not replace the muffler, but the catalytic section of the system. On its own, it does not change the aesthetics of the exhaust.
• The Arrow system type-approval is only valid with this catalyst installed: this is the warning the catalog provides on the RS4 125 page.
• The price refers to the catalyst only: the Thunder 51509AO silencer is a separate code and is sold separately.
• Arrow does not publish dimensions or the alloy of this item: before purchasing, compare the code with the assembly diagram of your system.
• Installation by qualified personnel is recommended.
Vehicle compatibility
| Model | Years | Versions |
|---|---|---|
| Aprilia RS4 125 | 2011/2016 | All versions – Arrow vehicle type TW |
The list is taken from the manufacturer's official catalog. If you have any doubts, send us your bike's VIN and we will check the correct code for you.
Who it is perfect for
It is the part needed for those who install an Arrow exhaust on their Aprilia RS4 125 and want to stay street-legal: without the catalyst, the system loses its type-approval, and the difference is noticeable during the vehicle inspection. It is also useful for those who have had an Arrow system installed for years and need to replace the catalyst, for example due to clogging or in preparation for an emissions test.
🛡️ Warranty and quality – Moon Bike S.r.l.
Original Arrow spare part, new and never installed. Moon Bike S.r.l. is based in Cercola (NA) and ships from Italy with invoice and manufacturer warranty.
Original Arrow spare part, new and never installed. Moon Bike S.r.l. is based in Cercola (NA) and ships from Italy with invoice and manufacturer warranty.
Frequently asked questions
Which bikes is the Arrow 11013KZ catalyst installed on?
The official Arrow catalog dedicates it to the Aprilia RS4 125 produced from 2011 to 2016, identified by vehicle type TW. There are only two codes on that catalog page: this catalyst and the Thunder 51509AO silencer. When in doubt, send us your VIN before ordering.
What exactly is the catalyst for?
It is the component that reduces emissions and makes the Arrow exhaust system type-approved. The catalog states this explicitly with a warning in red: the type-approval is only valid with the catalyst present. Without it, the motorcycle is not compliant for road use.
Is the silencer included?
No: the package contains only the 11013KZ catalyst kit. The 51509AO aluminum Thunder silencer is a separate code in the Arrow catalog and is sold separately. If you need that as well, write to us and we can tell you if it is in stock.
Can I install it with the original exhaust?
Arrow indicates that its components are interchangeable with the original ones, so the catalyst fits in the same position as the corresponding stock section. However, the combination provided by the catalog for this bike remains the one with the Arrow 51509AO silencer.
Does it have a port for the lambda probe or a db-killer?
No, neither. The Arrow catalog states for this code: lambda probe: no, CO probe: no, and db-killer: not provided. The db-killer concerns the silencer, not the catalyst, and is an accessory for other exhaust lines.
What material is it made of and how much does it weigh?
Arrow does not publish the alloy or the dimensions of this catalyst: for this reason, the datasheet simply indicates metal. The body is a metal cylinder enclosing the catalytic honeycomb. The weight declared by the manufacturer is 0.5 kg.
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.