Going back to the question of what went there in the 2008 models, I said it was a DC/DC because someone from Tesla said that in an interview. Then later someone else from Tesla said it was part of the HVAC system which made more sense to me. (So reports of what went in that location were inconsistent). If this new unit takes the place of the old "Toaster", I am guessing it is just a different air-conditioning controller. But, so much is changed for the "Roadster 2" 2010 models that I can't say for sure.