Engine check light????

[daz veedub]

Yeah mine is an agu daz, i'll have a look later and see which one will run higher boost then do away with the controller.

replace the boost controller for the same lettered n75 on urs already if ur getting codes for faulty maf your best looking in that direction 1st

[daz veedub]

A bad maf will cause you to be in limp mode (low boost) as well.  unplug the maf See if it improves. If it does you know thats the problem, but don't drive with the maf disconnected for too long