This is the new BMW M4 which is powered by a twin-turbo 3-litre straight six making 425 hp and 406 lb-ft of torque which is 11 hp and 111 lb-ft of torque. While that is a healthy upgrade, specially the increase in torque, the engine noise is rather disappointing.. Below is a video showing a 2015 BMW M4 start up and rev. You can actually hear someone in the background saying that it sounds like a Prius. Many diehard M3 fans and auto enthusiasts in general were bemoaning the switch to a turbo engine and now there's another disappointment, the engine noise. If you have a laptop, I recommend plugging in good speakers, preferably with a woofer, or at least head phones because laptop speakers will make it terrible. This is the new BMW M4 which is powered by a twin-turbo 3-litre straight six making 425 hp and 406 lb-ft of torque which is 11 hp and 111 lb-ft of torque. While that is a healthy upgrade, specially the increase in torque, the engine noise is rather disappointi...







