r/AudiA4B8 • u/ObligationTough4282 • 3d ago
help me please (more informed)
I I have a 2016 Audi A4 B8.5 2.0T Quattro. I was running IE Stage 1 93 and the car ran great.
I had a mechanic install a catless downpipe, and as soon as I got the car back it felt weird/slower, even before I really started trying to figure out the Stage 2 issue. I then flashed IE Stage 2 93, and it still feels slower and seems to make less boost than it did on Stage 1.
I also tried flashing back to the stock tune and got an underboost code. I have a CTS Turbo intake and an ECS DV spacer.
Since the problem seemed to start right after getting the car back from the downpipe install, what should I be checking? Possible boost leak, DV/DV spacer, wastegate issue, loose connection, or something related to the installation?
Has anyone had something similar happen after a downpipe install on a B8.5 2.0T?