[int2str]

2008 135i, Cobb AP, FMIC, DPs, Forge DV, DCI
29k miles

Car started stuttering out of turns, then reduced power icon...
The car now tops out at 8psi of boost (exactly, all the time, repeatable). Car is also louder than normal.

The Cobb reads code P30FF with underboost on "Turbo 2".

Given the fact that boost is pretty much cut in half and the fact that it repeatedly holds at exactly 8 PSI, I'm guessing that I do not have a FMIC, charge pipe or DV leak.

Since it only seems to affect one turbo, I'm guessing the wastegate is stuck open in one turbo.

My questions:
1. Which one is "turbo 2" front or back?
2. What causes the wastegate to stay open?
- a. Vacuum line to wastegate/canister?
- b. Actuator arm?
- c. Other?

Any other ideas that could cause this?

Thanks!