Akrapovic Racing Line Carbon Full Exhaust System – Aprilia RS 660 (2020-2024) S-A6R4-HAPC

EC/ECE type-approved and fully Euro 5 compliant, the Akrapovic Racing Line (Carbon) is the definitive full exhaust system for the Aprilia RS 660. Engineered to extract genuine performance gains from the 660 cc parallel-twin while meeting every road-legal certification requirement, it combines a carbon fibre slip-on silencer with stainless steel and titanium headers for a system that is as track-worthy as it is street-legal.

Key Features

• EC/ECE type-approval and Euro 5 compliance — fully road-legal without any re-registration or paperwork headaches
• Catalyst and dB-killer included as standard, satisfying both emissions and noise regulations straight out of the box
• Genuine power gain of +2.4 hp over the stock system, reaching 97.8 hp at 10,690 rpm on the 660 cc twin
• Torque increase of +3.6 Nm at 10,250 rpm for sharper, more immediate throttle response across the mid-range
• Weight saving of 0.4 kg compared to the standard exhaust (stock: 6.8 kg, Akrapovic: 6.4 kg)
• Plug-and-play installation — no ECU remapping or additional programming required
• Carbon fibre silencer with stainless steel and titanium construction delivers a rich, sporting exhaust note (+2 dB at 6,500 rpm over stock)

Construction and Certification

Akrapovic constructs the Racing Line (Carbon) from a combination of aerospace-grade materials. The silencer outer sleeve is crafted from carbon fibre, giving the system its distinctive race-inspired appearance and contributing to the overall weight reduction. The headers and mid-section are produced in stainless steel and titanium — materials chosen for their resistance to heat cycling, corrosion and fatigue under sustained high-rev use. Every component is manufactured to the tolerances Akrapovic maintains across its MotoGP and WSBK supply programmes.

Crucially, this is not a track-only system with paperwork compromises. The integrated catalyst and dB-killer ensure the Racing Line (Carbon) holds full EC/ECE type-approval, so it can be fitted to a road-registered Aprilia RS 660 without any change to the vehicle's legal status. Euro 5 conformity is verified, not claimed — a meaningful distinction for riders who use their machine on public roads as well as at circuit days.

Performance on Road and Track

The measured performance figures speak for themselves: 97.8 hp at 10,690 rpm and a torque peak improved by 3.6 Nm at 10,250 rpm represent meaningful, dyno-verified gains rather than marketing estimates. The improved exhaust gas flow that produces those numbers also sharpens throttle pick-up through the mid-range — the part of the rev range that defines the feel of a road ride far more than peak power alone. Sound output rises to 102 dB at 6,500 rpm, delivering the character the parallel-twin deserves without breaching legal limits.

Fitment and Compatibility

This system is designed exclusively for the Aprilia RS 660, covering all model years from 2020 through to 2024. No modifications to the airbox, ECU mapping or chassis are required. The system is available as a complete exhaust alone or as a complete exhaust bundled with the dedicated mounting bracket for a clean, rattle-free installation.

Specifications

• Part number: S-A6R4-HAPC
• Type: full exhaust system with carbon fibre slip-on silencer
• Materials: carbon fibre (silencer), stainless steel and titanium (headers/mid-section)
• Certification: EC/ECE type-approved, Euro 5 compliant
• Power gain: +2.4 hp (97.8 hp at 10,690 rpm vs. stock 96.6 hp)
• Torque gain: +3.6 Nm at 10,250 rpm
• Weight saving: -0.4 kg (Akrapovic 6.4 kg vs. stock 6.8 kg)
• Sound level: 102 dB at 6,500 rpm (stock: 100 dB)
• Fitment: Aprilia RS 660 (2020–2024)
• Installation: plug-and-play, no ECU remapping required