Understand what you are saying but its a forum and this is a tech debate ... Piston pics needed and just to remember its only 3. 5 to 4 deg over the calculation therefore chance is where I mapped it and hit top line to find mbt then worked back was correct . . What everyone is missing is eaven tho my charge for mapping was low I still spent 4 hours on said car ... No one is bum licking anyone ! Stu I have had contact with many times and also share the same feelings about exs lol Stu is clever and in my book there is him and mark shead