Tell me about it.
I've learnt the hard way. I returned yesterday and had a revised map which has made the engine less harsh but now the car sounds like its got a boost leak!
I've replaced the intercooler I-rings and pressure tested the intercooler and all the pipework up to 28 psi and have no boost leak.
I'm sure its a problem in the mapping now and wish if left the car standard.
Now I'm nearly £400 lighter and my car isn't right.