Quote:
Originally Posted by Drop the hammer
I might try to install the gfb dv+. To eliminate that possibility (a leak there at higher boost levels that may not show up at lower stock boost levels). Although if it was leaking past it, I would think it would show up at the stock 12psi as well. Cheap enough to change as I’d do it myself.
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I highly suggest DV+ because it holds the boost well. The part is cheap but the labor is high since it's not easy to install. Remember to find the good shop to install that part I had a installation issue before and caused some issue. I have similar setup like you do but CTS open Intake, FTP charge/boost/inlet pipes upgrade....
Wish we can figure out the root cause. BTW, my buddy from BMW tech mentioned they have changed couple OEM wastegate under warranty...