⟲ 360° — drag meThe facts.
| Brand | SC-Project |
|---|---|
| Model | S1 Slip-On |
| Part Number | Y11B-T41T |
| Fitment | Yamaha YZF-R1 / YZF-R1M RN49 (2017-2019) |
| Material | Full titanium body, carbon fibre end cap, carbon heat shield |
| Silencer Weight | 1.2 kg (OEM: 1.5 kg — saving 0.3 kg) |
| Power Gain | +1.2 hp at 12,000 rpm |
| Torque Gain | +0.9 Nm at 11,900 rpm |
| Homologation | EURO 4, EC and TÜV road-legal |
DescriptionThe whole story▼
The SC-Project S1 is one of the most respected slip-on silencers in superbike racing, and this titanium version brings that same race-bred engineering directly to your Yamaha YZF-R1 or YZF-R1M RN49 (2017-2019). Road-legal under EURO 4, it delivers a genuine gain in power and torque the moment you leave the garage — no ECU remapping required, no compromise on daily rideability.
Key Features
- EURO 4 road-legal approval (EC and TÜV homologation) — fully compliant for everyday street use with dB-killer included
- Measured performance gains of +1.2 hp at 12,000 rpm and +0.9 Nm torque at 11,900 rpm over the standard system
- Weight saving of 0.3 kg compared to the OEM silencer (SC-Project S1: 1.2 kg vs stock: 1.5 kg) for a lighter, more responsive feel
- Full titanium construction with CNC-machined titanium bushings and TIG-welded titanium joints for long-term durability and heat resistance
- Matte carbon fibre end cap and titanium flame mesh outlet deliver a purposeful racing aesthetic without sacrificing legality
- Full titanium link pipe included for a direct, clean connection to the original catalytic converter
Construction and Craftsmanship
SC-Project designed the S1 around a conical full-titanium silencer body — the same tapered geometry you see on factory World Superbike machinery. Every weld is TIG-finished by hand, and the CNC-machined titanium bushings ensure each joint is precise and rattle-free over the long term. The matte carbon fibre end cap handles extreme outlet temperatures with ease, while the carbon heat shield included in the kit adds a layer of thermal protection and a cohesive look that elevates the entire rear of the bike.
High-temperature acoustic damping material within the canister has been tuned specifically for the crossplane-crank character of the R1 engine, producing a deep, dark, aggressive race note that builds with revs. The titanium flame mesh at the outlet is a detail borrowed straight from SC-Project's competition catalogue.
Sound and Road Use
With the dB-killer fitted, the S1 sits within EURO 4 noise limits and is fully road-legal throughout Europe. Remove it for track days and the exhaust note opens up considerably, revealing the full acoustic presence that has made this system a favourite among R1 trackday riders. The transition between the two states is straightforward — the dB-killer seats securely and can be swapped in minutes at the paddock.
Installation
The S1 is a genuine bolt-on replacement requiring no fuelling changes or ECU modification. The included full titanium link pipe mates directly to the original catalytic converter and uses the stock mounting points, so fitment is clean, tight and permanent. Mounting springs and bolts are supplied in the kit alongside the homologation card and SC-Project decals. The entire installation can realistically be completed with basic tools in under an hour.
Fitment and Compatibility
This SC-Project S1 slip-on silencer is designed exclusively for the following models:
- Yamaha YZF-R1 RN49 — 2017, 2018, 2019
- Yamaha YZF-R1M RN49 — 2017, 2018, 2019
Fits all EURO 4 variants of the RN49 generation. Confirm your model year before ordering.
Specifications
- Part number: Y11B-T41T
- Type: slip-on silencer with titanium link pipe
- Material: full titanium body, carbon fibre end cap, carbon heat shield
- Silencer weight: 1.2 kg (OEM: 1.5 kg — saving 0.3 kg)
- Power gain: +1.2 hp at 12,000 rpm
- Torque gain: +0.9 Nm at 11,900 rpm
- Homologation: EURO 4, EC and TÜV road-legal
- dB-killer: included
- Warranty: 24 months (official SC-Project)
What's includedEverything in the box▼
- SC-Project S1 slip-on silencer (titanium)
- Full titanium link pipe for direct fitment to original catalytic converter
- Carbon fibre heat shield
- Mounting springs and bolts
- SC-Project decals
- Homologation card
FitmentWhich bikes this fits▼
- Yamaha YZF-R1/M RN49 (2017–2019)
Questions, one topic at a time.
Get the real shipping cost for this item to your address — the same rates as checkout.
Choose a destination and hit Estimate — we fetch the live rates for this item.
We’re based in Germany. Standard delivery goes by DHL and national postal services and takes about 2–5 days within Germany, 1–2 weeks within the EU and 2–6 weeks outside the EU. Need it sooner? Express delivery reaches most of the world within a few days — just choose it at checkout where available.
Your exact shipping cost is calculated by destination and weight and shown at checkout before you pay — no hidden fees. Express delivery is selectable at checkout where available.
Yes, we ship to over 130 countries. Prices, taxes and delivery times for your destination are calculated automatically at checkout.
Within the EU, no — our prices already include all duties and EU VAT. For deliveries outside the EU (e.g. Switzerland, the UK or the USA), your order may be subject to import duties and taxes set by your country. These are collected by the carrier when your parcel arrives, aren’t included in our prices, and are outside our control.
As soon as your parcel ships we email you a tracking link, so you can follow it all the way to your door.
On out-of-stock items you can request a delivery time or leave your email to be notified the moment it returns — just use the notification box on the product.
You have the right to cancel within 14 days of receiving your order. Register your return by email first; once it’s approved you have a further 14 days to send the goods back. Items should be unused and in their original packaging.
Register your return by email with your order number before sending anything back, and we’ll send you the return instructions. Please note: returns that aren’t registered in advance can’t be accepted.
The quickest way is to place a new order for the size you need and register a return for the original by email — just let us know it’s an exchange.
We’re sorry — that shouldn’t happen. Contact us with your order number and a photo as soon as you can, and we’ll arrange a replacement or refund right away. Faulty goods are always covered by your statutory warranty.
Refunds go back to your original payment method, usually within 3–5 working days of your return reaching our warehouse.
PayPal, all major credit and debit cards (Visa, Mastercard, American Express), Klarna (pay later and instalments), Apple Pay, Google Pay and more — all processed securely via PayPal and Mollie.
Yes. Choose Klarna at checkout to split your purchase into flexible monthly installments.
Your payment is taken when you place your order. If you choose Klarna, you pay later according to Klarna’s terms.
Every payment runs over an SSL-encrypted connection through certified providers. We never see or store your full card details.
If your order hasn’t shipped yet, contact us as soon as possible and we’ll do our best to change or cancel it.
No — you can check out as a guest. An account simply lets you track orders and reorder faster.
For customers in the EU, prices are shown including your country’s local VAT. For customers outside the EU, prices are shown without VAT — instead, your country’s import taxes and duties may apply on delivery (see the customs question).
Yes. Your invoice is attached to your order confirmation email and is also available in your account.
Yes. We’re an authorised dealer, so every product is 100% original and comes with the full manufacturer warranty.
Yes. Everything we sell is genuine and comes with the manufacturer’s warranty, on top of your statutory rights. Keep your invoice as proof of purchase and contact us if you ever need to make a claim — we’ll help you through it.
Our team is happy to help. Use the contact button below and we’ll personally help you choose the right gear or part.
Measure your head circumference about one centimetre above your eyebrows and compare it with the size chart on this page. Between sizes? Choose the smaller one — the padding beds in with use.
Yes — it’s tested and approved to the current ECE 22.06 standard and road-legal across the EU.
Most of our touring and sport helmets are Pinlock-ready and many include the insert. Check the ‘What’s in the box’ section on this page for this model.
Yes — the cheek pads are channelled so the arms of your glasses slide in comfortably.
Take out the washable lining and hand-wash it in lukewarm water. Clean the shell and visor with a soft cloth and water only — never solvents.
Our team will personally help you choose the right gear or part — around 24h for a reply.