Sports Car aggressiveness

I am starting to focus on getting my Sports Car license & rating a little higher, as I typically will sit in open wheel ovals & road.

My main question is this: how aggressive do y'all who focus on Sports Car tend to be when passing/defending in terms of door to door banging? I'm coming from races where that's a death sentence, and I feel like being afraid of contact in GT4 where I've been racing lately is going to cause me to leave some positions on the table.