In addition to the Bugatti Centodieci and McLaren Speedtail, Update 13.1 also includes the race-spec Nissan Z GT4 and Ford Focus ST.

One of only 56 Dodge Chargers equipped with the Hemi/automatic combo in 1970, this Mopar is also a highly-original, low-mileage survivor.

We're comparing the spec sheet for the GM Duramax V8 L5P engine against its main rivals from Ford and Ram to see how it ...