[KMPrenger]

Might just be my opinion, but I think the combination of a special color (the 45th got the metallic black whatever it was called), wheels, emblems/exterior trim, and interior trim is pretty good. Past that you'd be looking at special anniversary only performance upgrades that I just don't think you wouldn't be able to get on the non-anniversary models. Doing the necessary testing/development needed to toss in a special engine or suspension setup just for an anniversary model sounds way to costly to me.