Week 4 of the Forza Motorsport 7 car reveals is packed with 'Murican muscle.

As sure as day turns to night, another week arrives where Turn 10 reveals yet more cars headed to Forza Motorsport 7. This week is American week, so you'll find plenty of muscle and much more from the finest brands the U S of A has to offer.

The headline act is the 2016 Ford Shelby GT350R.

The "R" in GT350R may as well stand for "radical" when you consider how much better Ford Performance made an already amazing car. Powering the GT350R is a flat-crank 5.2-liter V8 churning out more than 500 horsepower and blasting one of the most amazing sounds in exhaust history. But it only gets better as you explore the rest of this modern muscle masterpiece. With carbon fiber wheels (the first to come from a major manufacturer), adaptive magnetorheological suspension and sculpted aero, the GT350R is nothing less than an apex-gulping track day weapon, full of bad intentions. Take it for a spin in Forza and watch the records fall.

Other notable inclusions this week are the 2017 Ford GT and F-150 Raptor, the 1992 Ford Escort Cosworth, 2015 Dodge Challenger Hellcat and the 2017 Chevrolet Camaro ZL1.

Find out more about this weeks American theme over on the Forza Motorsport blog.