10th owner on an 07 GTi. Had a remap which I was told that it was overwriting a previous sh*t map. Was happy as Larry. The thing was a monster. It’s just hit 100k and recently started hissing at the power band and doesn’t vent when I let off the pedal. It no longer has the naughty attack when it hits the band. The boost is 25% of its best form. I’ve had several garages look at it. All said there is no leak and the turbo is running fine. They just can’t pinpoint the issue. Most recent said it could be the solonoid (turbo sensor) has anyone had something similar? I’ll be honest. I rag the pants off the poor girl.