SC-Project SC1-R Slip-On Silencer Yamaha YZF-R6 RJ27 (2017-2026) Carbon – Y21A-L90C

Forged from the same philosophy that drives SC-Project's Superbike World Championship programme, the SC1-R slip-on silencer for the Yamaha YZF-R6 RJ27 (2017-2026) is a masterclass in exotic materials and precision engineering. Carbon fibre, titanium and TIG-welded bracketry combine to deliver a road-legal (EURO 4) exhaust that is as refined in its construction as it is relentless on circuit.

Key Features

• Asymmetric diamond-section canister optimises aerodynamics and gives the R6 an unmistakably aggressive racing silhouette.
• Matte carbon fibre end-cap minimises weight at the tail and offers outstanding heat resistance under sustained high-revving use.
• CNC-machined titanium coupling bushes guarantee micron-level precision fitment and perfectly aligned exhaust flow.
• TIG-welded titanium brackets provide exceptional structural rigidity while maintaining the clean, uncluttered aesthetic SC-Project is renowned for.
• Integrated carbon fibre heat shield manages thermal output effectively, protecting surrounding bodywork and rider.
• Removable dB-killer gives you two characters in one silencer: road-compliant sport note with the insert fitted, full-spectrum MotoGP roar without it.

Build Quality and Premium Materials

What separates the SC1-R from catalogue exhausts is the uncompromising selection of materials. The main canister shell is formed from ultra-lightweight carbon fibre, keeping unsprung and overall mass to an absolute minimum without sacrificing stiffness or longevity. The coupling bushes are individually CNC-machined from titanium billet, ensuring every unit leaves the SC-Project facility in Padova meeting the same exacting tolerances demanded by factory Superbike teams. TIG welding — the same process used for aerospace-grade joints — is applied throughout the bracket assembly, producing smooth, pore-free beads that resist vibration fatigue across thousands of kilometres.

The matte carbon fibre end-cap is not a cosmetic afterthought; it serves a genuine thermal management role, channelling exhaust gases away from heat-sensitive components and contributing to the silencer's remarkably low mass. Together, these choices reflect an exhaust engineered from first principles rather than adapted from a road-bike catalogue.

Performance Gains

The SC1-R is not purely a styling exercise. Fitted to the Yamaha YZF-R6 RJ27, the optimised exhaust routing and reduced back-pressure translate into measurable gains at the wheel: +2.8 PS at 14,200 rpm for sharper top-end acceleration and increased top speed, and +1.5 Nm of torque at 12,000 rpm for improved throttle response and mid-range pull out of slower corners. The reduction in system mass improves the R6's agility and changes-of-direction feel in a way no power figure alone can convey.

Sound Character

With the dB-killer installed the SC1-R produces a deep, sporting exhaust note that is entirely appropriate for road use and comfortably within EURO 4 limits. Remove the insert and the silencer delivers the full, unrestrained sound spectrum associated with SC-Project's MotoGP-derived canisters — a genuine racing soundtrack suited to track days and closed circuits. Two exhaust characters, one installation.

Fitment and Compatibility

This silencer is a direct slip-on replacement for the Yamaha YZF-R6 RJ27, covering model years 2017 through 2026. No modification to the existing header system is required. The EURO 4 homologation card is included for road registration purposes.

What's Included

• SC-Project SC1-R slip-on silencer in carbon (part number Y21A-L90C)
• Mounting springs and bolts for straightforward, secure installation
• SC-Project laser-etched logo badge
• SC-Project decal set
• EURO 4 homologation card
• 24-month official SC-Project warranty

Specifications