The BMW X6 M
is one feisty German crossover with a penchant for power. Evotech has stoked the Bimmer's 555-horsepower 4.4-liter twin-turbocharged V8 engine up to an impressive 730 horses and recently took it to Russia to test its Stage 4 mods against a supercharged Jeep
and a Porsche
911 Turbo S. The first challenger takes the form of a Jeep Grand Cherokee SRT
-8. The American SUV's 7.0-liter V8 has been equipped with a supercharger and nitrous for an impressive total output of 800hp.