Noticed recently that the car seemed to have lost some pep, followed by CEL for "under boost" after going full throttle. Thought maybe it was boost solenoid/hoses but wasn't. Was about to remove downpipe to check for clogged catalytic converter when I wiggled the wastegate flapper. Let's just say the flapper is trying out new positions that weren't possible before. Engine sound is from another car running in the background.