My old s2 was upto 150K it was chipped on a 195 turbosystems chip, running about 16psi, -31 actuator, filter, zorst, wen't well and engine was still good when I broke the car so sold it on.... But yea, you run the risk of it going bang, but if u chip it and do little bits and make sure it is setup by a reputable tuner on the rolling road u can't go worng