A standard BMW M3 is powered by a V8 liter engine that delivers a total of 420 HP. This may be rather impressive for a sports coupe, but take it to an experienced tuner and it can get even better. This was Manhart Racing’s goal as they prepared an impressive update package for the most powerful model in the 3-Series line-up.

The BMW M3 V8RS by Manhart Racing is no chump. The standard V8 engine has been replaced by the S63 engine from the X6M SUV mated to the X6M automatic transmission and, thanks to some ECU mods and a new exhaust, can now deliver an unbelievable 724 HP and 641 lbs-ft of torque. Manhart Racing has yet to announce what this tremendous boost in power has done to the performance of the sports coupe, but with that much extra horsepower, we can just imagine the mind-bending improvements it can deliver.[...]

Source: topspeed Tuning