SC-Project S1 Slip-On Silencer Yamaha YZF-R1/M RN65 (2020-2026) Titanium – Y11C-T41T

Euro 5 road approval and genuine WSBK-derived engineering — the SC-Project S1 Slip-On for the Yamaha YZF-R1/M RN65 (2020-2026) is the rare silencer that delivers full legal compliance without a single compromise on performance or sound. Constructed entirely in titanium and certified to EC and TÜV standards, the S1 gives you a measurable power gain, a deep racing exhaust note, and a kit that bolts straight on without ECU remapping.

Key Features

• EC and TÜV homologated to Euro 5 — fully legal for road use, dB-killer included as standard
• +1.4 hp at 12,000 rpm and +1.1 Nm torque at 12,250 rpm over the stock silencer
• Weight saving of 0.3 kg: S1 unit weighs 1.2 kg versus 1.5 kg OEM
• Full titanium silencer body and full titanium link pipe for direct fitment to the OE catalyst and header
• Carbon end cap with specialist acoustic damping material for a deep, unmistakeable racing tone
• No ECU tuning required — direct bolt-on installation, ready to ride immediately

Homologation and Legal Compliance

The S1 carries official EC and TÜV approval, conforming fully to Euro 5 emissions and noise regulations. The supplied dB-killer brings the exhaust note within legal limits on public roads while still producing the deep, pressurised sound that defines SC-Project's racing heritage. The homologation card is included in the box, so the paperwork is handled from day one.

Unlike many performance systems that force a choice between road legality and genuine character, the S1 holds both. Remove the dB-killer for closed circuit use and the character of the full titanium construction becomes immediately apparent.

Performance and Engineering

SC-Project's motorsport division has campaigned exhausts in the Superbike World Championship for years, and the S1's architecture reflects that lineage directly. The full titanium link pipe creates a straight, unobstructed connection to the OE catalyst, which is why no remapping is needed — the flow geometry is optimised for the standard fuelling map. The result is a clean, consistent +1.4 hp at 12,000 rpm and a +1.1 Nm torque improvement at 12,250 rpm, precisely where the R1's crossplane inline-four is working hardest.

Hydroforming technology shapes the pipes without seams or welds at stress points, and every joint is finished with TIG welding for long-term durability under sustained high-temperature cycling. The carbon heat shield included in the kit protects surrounding bodywork and rider hardware from the elevated temperatures titanium generates in use.

Materials and Craftsmanship

The silencer canister is full titanium — not a titanium-coated steel unit — chosen for its exceptional strength-to-weight ratio and resistance to corrosion and heat discolouration over time. The carbon fibre end cap is formed with the same precision tooling used on SC-Project's track-only catalogue, providing a visual signature that is immediately recognisable and structurally integral rather than decorative.

Together, titanium, carbon fibre, and hydroformed pipework represent SC-Project's benchmark for design and performance in the road-legal slip-on segment.

Fitment and Compatibility

This exhaust is designed and homologated specifically for the following motorcycles:

• Yamaha YZF-R1 RN65 — 2020, 2021, 2022, 2023, 2024, 2025, 2026
• Yamaha YZF-R1M RN65 — 2020, 2021, 2022, 2023, 2024, 2025, 2026

Compatible with all Euro 5 variants of the RN65 generation. Connects directly to the OE catalyst and header; no additional adaptors or ECU modification required.

Specifications

• Part number: Y11C-T41T
• Silencer material: full titanium
• End cap: carbon fibre with acoustic damping material
• Link pipe: full titanium
• Silencer weight: 1.2 kg (OEM: 1.5 kg — saving: 0.3 kg)
• Power gain: +1.4 hp at 12,000 rpm
• Torque gain: +1.1 Nm at 12,250 rpm
• Homologation: EC and TÜV, Euro 5
• ECU remap required: no
• Warranty: 24 months (SC-Project official)