Live from Detroit: Range-topping Z4 unleashed

This is the new top of the range Z4, revealed on Monday at the Detroit motor show, with 335bhp and performance to match the M3 and M5.

It's called the sDrive35i and is fitted with a warmed over version of BMW's excellent straight six engine, featuring a new overboost function that temporarily raise torque to a whopping 369lb ft for crushing mid-range acceleration.

Fitted with the seven-speed dual clutch gearbox, this Z4 deals with the 0-62mph dash in just 4.8 seconds and can go on to an electronically limited 155mph top speed.

The M Sport and M Suspension packages are fitted as standard, while lower bumpers and new 18-inch alloys mark it apart from the standard car. It'll be loud too because BMW has adjusted the exhaust system to offer "powerful acoustic feedback."

The Z4 xDrive35i goes on sale in the spring priced from £43,885.