Flat-four/Boxers?

Forgive me if this has been mentioned before but are you guys planning on adding some boxer engines? Im not exactly clued up on them so I cant give names or figures but I think it would be nice to see something different.
A tycoon game made for people who live and breathe cars.
http://phpbb3.automationgame.com/
T16 wrote:Game at launch thread which include a list of engine types