1995 mustang GT. Installed a Flowmaster Catback exhaust. Had everything finished except one of the tailpipe. I woke up this morning and there wa a oil on cardboard I put under the car. A decent amount in 2 spots. Oil light was on and dipstick read under where says to add oil. The leak looked like it was under where the midpipe goes up to the headers towards front of car judging from cardboard. I'm assuming I caused it from shaking the midpipe when moving the mufflers around when I attached then and was adjusting them. Could this have caused it?