Hi it's me again thanks for all your replies before but this is a major issue for me basically the car is still doing it won't rev past 3k and just back fires all the time in every gear the hotter the car gets the worse it gets I have a turbo fan switch I switched it on and it don't seem to be doing it but surely it can't stay on for the whole drive ? Can some please help me it is really bothering me oh the car is focus rs mk1 . I have tuned boost down and bought a new actuator spring I was going to get it mapped again maybe it could be that ?

Thanks Luke