We saw a maximum of 21.8 psi of turbo pressure indicated on the E53's many performance-related displays, but it took a good few seconds to get there. The car's willingness to hold gears longer in ...

The new E53 relies on a similar powertrain to its predecessor ... capacity and has a single turbocharger compared to the twin-turbo set-up of the V6 and V8 engines. Recalibrated to better suit ...