OK, I bought a 96 mustang Cobra from a relative for $8,600, and sold it about a month later for $10,000 (Just to make money on it because it was a really good deal and couldnt afford insurance). This guy flew in from Connecticut to pick up the Mustang Cobra ( Bought it off E-Bay from me), there was never any warranty/bill of sale signed stating that he bought the car as is. Honestly I had no idea that this car would need all this work after this guy bought the vehicle. I was nice enough to help him pay for new lifters, and a new exhaust system Because I felt bad, now the guy is saying the engine is shot and it needs a new one, and he is trying to charge back his payment that he made via pay-pal on E-bay 2 months ago which was $10,000, and make me take the car back. Can he do really do that? please help me figure this out.. more detail the better, thanks!