Marvin Fonacier transformed his 1980 BMW 320i (E21) into a Group5-inspired race car. It is powered by a naturally aspirated 3.2 L S52 inline-six featuring dual VANOS and GS Projx custom exhaust. Behind that is a Getrag manual transmission with a short shifter. The car rides on CATuned coilover system and stops with Wilwood four-piston calipers with 300 mm floating rotor. Covering those are BBS E16 centerlock 17-inch wheels and Toyo Proxes R888R (235/45, 315/35). The most obvious modification is the Flying Brick widebody kit covered by a Team Ikuzawa livery.
Source: Toyo Tires, Toyo Tires FB page, and Larry Chen