700PS BMW X5 M by Manhart

Work started underneath the hood where the twin-turbo V8 4.4-liter normally develops an already generous 575 PS (423 kW) and 750 Nm (554 lb-ft). Manhart’s engineers thought there’s room for some improvements and applied their knowhow to squeeze more power from the motor. This was possible by tweaking the engine’s software and installing a custom exhaust system with dual 100-mm tips, bespoke downpipes, and stainless steel sport mufflers with valve control.

As a result of these upgrades, the V8 engine is now capable of developing a massive 700 PS (515 kW) at 6,500 rpm and 900 Nm (665 lb-ft) from 5,700 rpm. Manhart also removed the 155-mph electronic top speed limiter to allow the BMW X5 M achieve an impressive 196 mph (315 km/h). These figures are attainable for €7,500 (plus mounting), but there’s also a lesser package that takes output to 640 PS (471 kW).