[1.2gees]

I would use factory studs as well, especially over any "bolt" for the exhaust (even though I think he meant to say Saturn studs).

The studs should be installed properly in the head first, if that is done prior to tightenning the nuts, a problem is not likely to arise in the future.

As for the heat, I think unless extended track use is planned for a dual purpose car, underhood heat's not something to worry about on a mildly modified 951. Wrap will contain heat much better than coatings.

And not all 951s leak oil, I've had some that didn't leak ANY. If you've got one already leaking though, it's usually quite an adventure to get it to be dry...
Ahmet