DiRT Rally is now compatible with PlayStation VR through paid DLC on PS4. The entire game can be played in virtual reality, and the DLC introduces a new co-op mode, allowing a second player to act as a co-driver giving directions using a DualShock 4.
The VR DLC pack can be purchased separately from the PS Store for $19.45. For new players, a DiRT Rally + VR bundle is available for $70 (compared to $55 for the standalone game).
All modes, including rallycross and hillclimb, are playable using the PS VR headset, and have been optimised for PS4 Pro (only when playing in VR).