I remember seeing a 124 300D back at the old shop that ran like crap, smoked like a pig and wouldnt go over 20mph. The owner (70 year old lady) had been pulled over by the cops for driving too slow and putting out nothing but thick smoke. After pulling the exhaust off and starting it one more time.... POOF! Bob came out from his bay, actually more like came out from the black cloud that was now occupying his entire stall. It was like a small explosion and black smoke and dust was everywhere! what a sight, it was hilarious!
oh and after it had a new exhaust put on, the car ran fine