The car pulls hard, runs rich and boosts the full 6psi by 4500rpm, but at around 6500 the car stops boosting and actually falls into about 10in of vac at WOT. Does this sound like a Vac/ boost leak?

I'm running 6psi on an internal wastegate T3, custom kit with a Bosch BOV, dsm 450's and a MAP scaling circuit from filetofit as fuel management.

I thought that the MAP sensor might be seeing the boost, but I don't get a CEL. Though, the ouput of my scaling circuit was in excess of 2.9v... Then I thought that the BOV might be leaking boost (sincee it's wimpy) but I tried out a TurboXS and it still did the same thing. All my pipe connections are torqued down with a nut driver, though the intercooler inlet is a bit sketchy.

I mainly want to make sure I'm not killing my engine heh.

 

you mean your on the throttle all the way and the boost just dies off all of a sudden at 6500?

 

exactly. I'm WOT and the boost has built to 6psi or so and has been pulling hard, then it just frickin dies.