For the C5 RS 6 powertrain detail, the engine is an all-aluminium alloy twin-turbocharged ('biturbo'), double overhead camshaft, 5 valve per cylinder version of Audi's 4.2-litre 90° V8 petrol engine (parts code prefix: 077, identification code: BCY), developed and manufactured in Germany and the UK by quattro GmbH and Cosworth Technology (now known as MAHLE Powertrain). With the addition of the two turbochargers (one per cylinder bank), the power output of the V8 engine was increased to at 5,700 to 6,400 rpm, and generated of torque. The combination of the 4.2-litre V8, variable inlet valve timing, and twin turbochargers gave the RS 6 an exceptionally wide power band, with peak torque available from 1,950 to 5,600 rpm.