As for the body, RTR adds a bunch of accents including a windshield banner, RTR LEDs, new puddle lamps, front, side and rear quarter splitters, a Gurney flap, new rear diffuser, badges graphics and Ford Performance hood struts, which we have personal experience with and say they are a solid upgrade. Inside the cabin, in addition to the serialized stuff, you also get an RTR shift knob and RTR floormats.
The Series 1 gets a few handling upgrades including the Ford Performance Track Handling Pack for the non MagneRide cars and the Ford Performance MagneRide Suspension Kit for cars with the adaptive shocks. It also comes with an aluminum strut tower brace, Ford Performance wheels, RTR center caps and black lug nuts.