Depending on what plate it is on and what engine code I think it was some made on a 57 plate iirc.

Put it this way, Robbie's car (red DS modded ST) has been running 300+bhp for a long time now gone down the DS Turbo X route which is 330-350bhp and it hasn't gone boom and gets used on track and driven properly. As I said the number of cars that have actually suffered cracked liners are few and far between although since they will all converge on such forums, you will hear the stories of cracked liners being thrown around. IMO buy and enjoy.