SC Project 4-1 Stainless Steel Full Exhaust System, with SC1-R Carbon Fibre Exhaust- Honda CBR650R (21-23)
The SC Project 4-1 Stainless Steel Full Exhaust System, with SC1-R Carbon Fibre Exhaust- Honda CBR650R (21-23) combines a 4-1 full exhaust system with an SC1-R carbon fibre muffler. It uses SAE 304 stainless steel headers, carbon fibre for the body and end cap, and a bracket mounting system. The system delivers +1 hp at 10000 rpm and +0.7 Nm at 10000 rpm, while supporting Euro 5 street-legal use with the included catalyst. Visit our website for more parts and accessories of Honda
4-1 Full Exhaust System
SC-Project developed this full system through research, development and design work carried out by its R&D department together with major MotoGP and SBK World Championship Teams. The system was created for the Honda CBR650R with a focus on performance and aesthetics.
The 4-1 configuration uses SAE 304 stainless steel headers and includes a lambda probe connection. The system also includes a catalyst for Euro 5 homologation. In addition, the type approval is EC/ECE and the exhaust comes with a type approval certificate.
SC1-R Carbon Fibre Muffler
The SC1-R muffler draws on the experience of the SC-Project racing department in major world competitions. Its taut and decided lines give the Honda CBR650R a distinctive appearance.
The muffler features a carbon fibre body and carbon fibre end cap. Furthermore, the exit pipe uses hydroforming technology, while the carbon fibre end cap has a rhomboidal asymmetric shape. The SC1-R also uses T.I.G. welding, sound-absorbing material resistant to very high temperatures and CNC-machined insert bushings.
Technical Construction
The exhaust system uses CNC-machined bushings turned from solid. These components allow precise coupling, which makes fitting easier and supports the specified system performance.
SC-Project also uses pipes with variable dimensions. According to the supplied product information, this design provides an increase in performance in terms of torque and maximum power through the entire bend.
Power and Torque
The SC Project 4-1 Stainless Steel Full Exhaust System, with SC1-R Carbon Fibre Exhaust- Honda CBR650R (21-23) produces +1 hp at 10000 rpm and +0.7 Nm at 10000 rpm.
The system also retains the original lambda probe. Meanwhile, the lightweight system contributes to better bike rideability, as stated in the supplied product information.
Euro 5 Street-Legal Specification
This exhaust system includes a catalyst for Euro 5 homologation. It has EC/ECE type approval for street-legal Euro 5 use and comes with a type approval certificate.
The SC1-R carbon fibre muffler completes the system with its racing-derived design, hydroformed exit pipe and carbon fibre end cap.





















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