You should use spring loaded bolts. Because the engine is front wheel drive the motor does tend to move alot. You want some give in the exhaust movement.
That's why they give you springloaded bolts so there is give on you exhaust.
If they don't have give your exhaust will wear quickly. I'll put it this way, my friend busted his pipe in half within' 2 months. His motor did move a lot more than normal.
Point in short. Put some springloaded bolts on there.