When Bentley introduced the Arnage R, it was intended to provide a contrast to the more powerful and sportier Arnage T. This naming convention was somewhat unusual with R badging usually reserved for the more race track oriented vehicles.
For the 2005 modek year, the Arnage R made do with the same 6.75L twin turbo V8 engine as was found in the Arnage Red Label. However both power and torque were given a boost with power up 60 hp to 460 hp, and torque rising 40 Nm to 875 Nm. Top speed was rated at 170 mph with a 6.1 second 0-62 mph sprint.