So I am looking to buy a 03 RS six it has a lot of work done to it so on and so forth there's a misfire between cylinder two and six the guy told me the head has a crack in it therefore the misfire the entire front is been replaced the car hasn't MTM tune it is in very good shape I picked up the car for a very good price - thoughts anyone ,, do these cars have a habit of detonation why would the head crack I thought overheating but they said no ???,, also the car has brand new resealed brembos , A complete new polyurethane front and new transmission new torque converter ??? What are your thoughts do you think it is the head because the guy told me he scoped it and he saw a crack in the head between the two cylinders I bought the car for eight grand tell me what you think