Mid-Engined BMW M4 Silhouette w/ S54 N/A Straight-6 racing at Mugello Circuit! Drag & Track by turboandstance - April 25, 2019September 5, 2020 Enjoy the lovely sound of this BMW M4 Silhouette by JR Motorsport featuring a screaming mid-mounted BMW S54 N/A engine. The cars should weight around 1000 kgs and have nearly 500hp from the straight-6 unit. Watch the video below and leave a comment or share this one with your friends! Follow