i am assuming you never ate paint chips as a kid but.... did you check under were you put you jack??? i know this is a no brainer but my boss thinks he knows every thing about cars and he had to change a tire on his brand new m45 on the mass pike and when he jacked the car up he did not put the jack on the frame all the way and on the way down the jack slipped off the frame and landed on the left side of the exhaust and completely pinched off the left side of his exhaust.... car does not start any more had it towed to the dealer.