Between April 2004 and September 2004, there was a final limited run of an even higher-performance RS 6, named the Audi RS 6 Plus. This had an increased engine power output (identification code: BRV), and produced at 6,000-6,400 rpm, with the same of torque at 1,950-6,000 rpm. This engine was also developed and manufactured in the UK by Cosworth Technology (now known as MAHLE Powertrain). The additional performance was achieved with a new engine control unit (ECU), and two additional coolant radiators behind the side-mounted intercoolers (these were standard fitment on the standard RS 6 in hotter climate countries). Official performance figures indicate the discipline of sprinting from standstill to in 4.4 seconds. The RS 6 Plus carries on to reach in 20.36 seconds, and has an official top speed of .