Question,
I have a greddy kit installed on my 8 with the greddy turbo. now after a year I'm getting bad lag and no power at full boost. i'm still seeing high boost after the throttle body. would I still be seeing like 9 psi on a dying turbo? not sure if it's turbo related or engine related. Can turbo lag be caused by a dying turbo?

 

can you be a bit more specific about the lag and "no power" .

Does the engine start ok and idle ok at same vac levels it always has ?