I think, this like any other coupe is what was ordered by the customer or added options at the dealer. One of main objects of 2.5 was saving gas and also minimising trim. 2.5 does not suppose the have beltline trim, this one does, it's suppose to have regular steel wheels with hubcaps, this one has the BBS wheels (of course this is an easy change). Spolier is added. So, I amsure rear windows mechanisems could have been added as well. And, I am sure somewhere in its future is written that it's going to get a 3.5 engine!