After fixing a couple of leaks in my exhaust system the weekend I took it out for a spin to hear the vastly improved sound. The second it hit 3krpm limp mode struck and I hobbled home like an injured sparrow.
Few details - Exhaust is a milltek decat/downpipe followed by a straight through pipe. Car is a 2007 2.0tdi, and I did have a quick go at spraying some oven cleaner on the turbo to eliminate sticky vanes (a noticable amount of cr@p came out the back but not plumes and I've always used premium diesel + redex to keep everything as clean as possible).
Any ideas? I'm currently charging the laptop to see if I can get VCDS on the badboy.