Forza Motorsport 4: 1986 BMW M635CSi

This car has a fraternal twin, the M5

Introduced at the 1983 Frankfurt Motor Show and based on the E24 6-Series, the M635CSI (called M6 in the USA) uses the improved version of the six-cylinder engine that powered the BMW M1. It generates 286 PS (210 kW; 282 hp) of power and it was mated with a Getrag 280/5 five-speed manual gearbox.

In America, the M635CSi, or better known as the M6 back then, uses a catalyzed S38B35 motor engine which produces 256bhp of power, less than the Euro-spec ones to comply with North American emissions regulations.

This car was produced at BMW's Dingolfing plant from 1983 to 1989 with body shells sourced from Osnabruck-based Karmann works. Different versions of the M635CSi or M6 includes Two non-catalyst models for the European market (left-hand drive and right-hand drive), and three distinct catalyst versions for Europe, North America and Japan (all left-hand drive).