I want to see a modern 4cyl or 6 in an A-Body, but I would prefer it to be from some sort of chrysler product. Like an SRT-4 motor... would be cool. Even a V6 TT from a stealth/3000GT. 3.9 V6 is pretty cool too, but I know that one has been done at least a few times, and is pretty much a bolt in anyway.
