Hi guys, have a MY01 turbo with repo from RStuning, to 508hp. Amazing car!!! Car had recently a gas pump replacement, and now the boost won't go over 0.7/ 0.9 bar, when usually it would go 1,2 bar...any suggestions on w

 

Sounds like a boost leak. Do a boost leak test.

 

Check the hose clamp where the big Y pipe connects to the little F hose. It is to the left of the throttle body on the back of the Y pipe. Mine did this, and that is what it was.