My mistake, I didn't think the 2835s were DBB. Heat dispersement doesn't really have an effect on engine bay temps, but it's more like (speaking very theoretically, numbers are way off) say you have 1000 degrees going through your single turbine, there's gonna be a good bit of that spreading to the compressor, and heating up the intake air. You now have, let's say half that temp, 500 degree air headed to the IC. Now on the same engine, you do twins, you have two turbines to spread the heat amongst, so each turbine is getting 500 degrees, and like I said, the compressed air is heated to half of that, so you now have two compressors putting out 250 degree air, which combine to be a single 250 degree air charge entering the IC.

Reminder, those were just explanatory numbers, the actual results are going to be significantly less noticeable, I'm just one of those obsessive perfectionist geeks that's into all that efficiency such-'n-such. There's also the fact that the turbos are each exposed to less heat, extending their lifetime.
Another note is (even less noticeable than the heat dispersemnt factor) the fact that it's easier to move two smaller objects than a single one double the size of one...if that makes sense. Due to minute friction, air resistance, gravitational laws, etc., it's easier for a 5lb force to move a 1kg block than it is for a 500 lb force to move a 100kg block. Comparitively, it's why ants can lift 100x their body weight and we can't. [/tangent]

Get the 71. Plenty of show-stopper, big power Supras out there with single turbos!