Well blimey, same issue with mine today, out of nowhere loss of power during acceleration, boost almost non-existent prior to 3000rpm, exhaust making a loud booming sound during driving and noticed engine bay was very hot, no smoke noticed.
Searching posts for an hour and happy I found this one, as I did just about all the things JoelyMoley did except for check the hoses and bang there it was a split hose. Never expected it as the hoses are fairly new.
My boost and acceleration are back, quiet exhaust, very happy.
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