M Power Go! BMW Z4 GT3 is sweeeet!

This BMW Z4 GT3 comes fitted with the 4.0-liter V8 out of the M3. In race trim, that engine pushes 480hp through a six-speed sequential gearbox. This Z4 GT3 will be campaigned in FIA GT3 by Schubert Motorsport, who previously ran an M3.

You can buy one of these rides for $408,000 before tax. However, you may want to wait, since BMW can actually fit a V8 in their Z4. Maybe we'll see an M version on the Z4 after all...

Manhart boosts the BMW Z4 to 550hp

This RWD roadster features a V10 with 550hp. It runs 0 - 60mph in 3.9 seconds 0-60, has a curb weight of 3,212lbs and a power-to-weight ratio of just 5.8lbs/hp.

Also, Manhart has added a quad-tip stainless steel exhaust system, custom exterior treatment with 19-inch black alloy BBS Challenege wheels controlled by Bilstein PSS10 coilovers.