Michael Bay has unveiled the sixth vehicle he’s using for “Transformers 4.”

“The Ultimate Sonic RS, just pure fun,” the director said in a post on his website. He did not disclose details about the car’s Transformer name.

Bay has previously disclosed the 2013 Lamborghini Aventador LP 700-4 Coupe, the 1967 Camaro SS for the Bumblebee character and a military vehicle for the Hound character, for the movie.

Bay began shooting two weeks ago in Monument Valley. “Transformers 4″ stars Mark Wahlberg, Stanley Tucci, Kelsey Grammer, Nicola Peltz, Sophia Myles and Li Bingbing. Paramount has set a June 27, 2014 release date.