p0299 can be a cracked turbo, fissured pcv or diverter valve. In my case, my turbo had the exact same crack as yours and was underboosting a solid 0.4bar throughout the powerband. I've replaced it with a K04 now but the turbo housing was cracked around the wastegate and the CHRA failed. The hot side blades are all scratched up and the propeller has play in every direction. Plus there was a lot of oil in the intake. I'll attach some pictures tomorrow.