GP850T

Quick question concerning replacing my wastegate and BCS due to the following issues i have been currently running into, although not a big deal for a car that serves as a daily commuter at the present time it has always bothered me

Basically the issue occurs when it is time to pass on highways, down shift to lower gear and punch the gas, results in the boost being pretty wonky at times

the car will boost to 12-13psi then cut boost down to 5 psi then boost all the way back to 12-13 and then cut the boost again.

Currently running stock tune with stock bcs and wastegate.

Wastegate i would assume is getting old and because im up here in canada the little adjustment screw is rusted beyond any hope to even play with those settings and i guess the bcs is just unable to controll boost any longer.

So my question is hopign that my assumption is right and im looking to replace the bcs and or the wastegate at the same time, what kind of replacement options are out there. Keep in mind im running a 16t presently and propbably looking to upgrade sometime this summer.


Please advise Thank you