Was the GTI VR6 moded?
coz i have seen a stock GTI 1.8T with Chipped ECU ripped a ITR with I/E/H. well beaten...
if you haven't seen the stock 1.8T dyno sheep.. i would really want you to check that out.. it went flat after it goes to certain RPM, limited boost. so meaning with the chipped ECU that 1.8T dyno sheet looks pretty pretty you know..

well just my opintion..