MP Hot Rod (Hasbro)
The arm pipes (that become the front part of the exhaust pipes in car mode) on some samples see both arms have the same side piece.
Essentially this means that in car mode one side will line up properly but the other side won't.
Basically the the exhaust on both sides in car mode should look (very roughly) like this: __/----, but if you've got this factory defect one side will look like this: ----\----. When you're picking out one at TRU just make sure that both sets of arm pipes bow in the same direction.
I'm posting this here because after having a root around the internet it seems I'm not the only one with this problem.
Also I need a camera because my descriptive powers are horrid.