I got hit like you standing still and bang got rear ended. I looked at the hit and did not observe the muffler so like a gentleman I let the woman go since she had a kid crying in the car. About a week later the muffler starts grumbling louder and I take a look. It was hanging by a thread. $ 1,100.00 for the repair Audi 90 Quattro muffler.
HAVE IT CHECKED OUT NO MATTER HOW IT LOOKS TO YOU!!! Other members of the forum have made excellent points regarding possible damage. Believe me that all of their suggestions are truly worthwhile to have checked out.
Q is correct, the person that rear ended you has to pay including the deductible. Since it won't cost you a penny to be satisfied that nothing happened to the car take it to a reputable body shop place. Preferably one that deals in Porsches. Sorry about your hit.