⟲ 360° — drag meThe facts.
| Brand | SC-Project |
|---|---|
| Model | SC1-R |
| System type | Full system 2-1 |
| Header material | Stainless steel AISI 304 |
| Silencer material | Carbon fibre or titanium (variant dependent) |
| End cap material | Carbon fibre |
| Weight saving | -2 kg (stock 6.4 kg / SC-Project 4.4 kg) |
| Lambda sensor | Yes |
| Road legal | No — racing use only |
| Fitment | Aprilia RS 660 (2020-2024) |
DescriptionThe whole story▼
Born on the dyno and refined on the track, the SC-Project SC1-R 2-1 full exhaust system for the Aprilia RS 660 is the direct result of SC-Project's collaboration with Aprilia Racing on the RS 660 Trofeo championship. This is not a road compromise — it is a purpose-built racing system that removes the catalytic converter, eliminates unnecessary mass, and liberates the parallel-twin to perform exactly as the engineers intended at the limit.
Key Features
- Full 2-1 system engineered for the Aprilia Racing Trofeo RS 660, delivering optimised torque and peak power across the rev range
- Header pipes fabricated from AISI 304 stainless steel with CNC-machined couplings for a precision, rattle-free fit
- T.I.G. welded throughout for race-grade strength and a clean, motorsport aesthetic
- Catalytic converter removal reduces operating temperature and unlocks additional power
- SC1-R slip-on silencer available in carbon fibre or titanium — both chosen for maximum weight saving and race-day looks
- Carbon fibre end cap and dedicated carbon heat shield included as standard
- Lambda sensor port retained for ECU compatibility
Track Performance
The SC-Project SC1-R system trims a verified 2 kg from the stock exhaust weight, dropping from the factory figure of 6.4 kg to 4.4 kg. On a 660 cc machine where every kilogram of unsprung and centralised mass matters, that reduction translates directly into sharper turn-in, faster direction changes and reduced stress on the chassis between corner sequences. The optimised 2-1 collector geometry promotes a broader torque spread, keeping the parallel-twin pulling hard from the mid-range and carrying that energy through to the top of the rev range where race lap times are decided.
Build Quality
SC-Project manufactures this system to the same standards applied to its MotoGP and WorldSBK programmes. Every header joint is TIG welded by hand, the CNC-machined stainless couplings guarantee a gas-tight seal that survives repeated heat cycles, and the carbon fibre heat shield is bonded and finished to a standard that stands up to scrutineering. The anodised aluminium single-seat exhaust bracket is included and engineered to clear the pillion footpeg hangers without modification, keeping installation time to a minimum.
Fitment and Compatibility
This system is a direct, plug-and-play fit for the Aprilia RS 660 covering model years 2020 to 2024. It is compatible with the original pillion footrests. This system is for racing use only — it does not carry road-legal homologation and must not be used on public roads.
Specifications
| Attribute | Detail |
|---|---|
| System type | Full system 2-1 |
| Header material | Stainless steel AISI 304 |
| Silencer material | Carbon fibre or titanium (variant dependent) |
| End cap material | Carbon fibre |
| Weight saving | -2 kg (stock 6.4 kg / SC-Project 4.4 kg) |
| Lambda sensor | Yes — port included |
| Road legal | No — racing use only |
| Fitment | Aprilia RS 660 (2020-2024) |
| Part numbers | A23A-AC90C (Carbon) / A23A-AC90T (Titanium) |
What's includedEverything in the box▼
- SC-Project SC1-R full system 2-1 (stainless steel AISI 304)
- SC1-R slip-on silencer in carbon or titanium
- Carbon fibre heat shield
- Anodised aluminium single-seat exhaust bracket
- Springs and mounting bolts
- SC-Project sticker set
FitmentWhich bikes this fits▼
- Aprilia RS 660 (2020–2024)
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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.
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