Hoi, guys, I can only advise you all: check your vacuum hoses from time to time! In particular, the turbo fraction should keep an eye on it, especially the whole noise that goes from the turbo to the intake tract or to the charging pressure valve. I have now replaced some with silicone (thanks to Pafro) and oopsie-Daisy, all of a sudden the charging pressure indicator shows over a much larger range what is on and the pressure & flow rate has increased noticeably. It is also true for the other air hoses, e.g. those for the intercooler (precaution: relatively expensive with Volvo!), which also consisted of a lot of good will and n bit of residual tissue. Yes, our old lady. Hardly one repairs a part of it any other, which is now more burdened.