Well, we do not have pages for car manufacturers, but. I found a cool fact, that, I believe, you will find interesting enough. I was re-playing The Punisher, a small-known, but awesome game, made by Volition. In the second mission I've decided to take a closer look at the Punisher's car and, well, look at the attached picture! His muscle, though it does not appear in any of Saint's Row games, is made by TM.
Probably means that Punisher exists in Saint's Row universe as well... Watch your back, Saints.