The new M TwinPower Turbo V8 for the BMW X5 M and BMW X6 M is the most powerful engine ever developed by BMW for an all-wheel-drive vehicle. Boasting innovative M TwinPower Turbo technology with a pair of TwinScroll turbochargers, cross-bank exhaust manifolds, VALVETRONIC and High Precision Direct Injection, the 4.4-liter V8 produces maximum output of 567 hp between 6,000 and 6,500 rpm. That represents a 3 percent increase over the predecessor models. The step up is even clearer when it comes to the power development of the new engine. Peak torque has been boosted by 53 lb-ft which equates to a rise of 10 percent. Its 553 lb-ft can be enjoyed across a broad rev range between 2,200 and 5,000 rpm.