G force

This is the absurdly named G-Power G4 3.0i Evo III... or a tweaked Z4, in other words.

Built by G-Power, the Z4 gets a power boost from 231bhp to 375bhp thanks to a whirling dervish of a supercharger.

The result is a top speed of 188mph and a 0-62mph time of just 4.9 seconds. A very smokey 4.9 seconds, we presume.

There's also an aero kit, lightweight 20-inch alloy wheels and suspension modifications including coilovers that should improve the Z4's notoriously rough ride.

Added to that there's a high-performance brake system and some interior tweaks.

The conversion costs around £15,000; the chepaest secondhand 3.0i Z4 we could find cost £12,000.

Mmm...

£27,000 for a 188mph supercharged Z4? Oh go on then.