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The way i understand it is that the ecu can use the n75 to control the wastegate. as the turbo builds up boost the wastegate opens, the ecu can operate the n75 to vent some of the pressure so either the wastegate does not open, or opens less

I'm sure someone else will have a better explanation than me
 
Thanks Guys!!

I though that N75 was a different bit altogether :D and i was like "how can that thing do all that" LOL. Well now i know :D