I recently got my car back from the garage after having a new cat put on as there was a hole in the exhaust by the old one, when I got it back it was a completely different car, it now has hardly any power, the turbo does seem to come in at around 3500/4000 rpm sometimes at around town speeds, but on the motorway the car doesn't want to rev over 3000 rpm at all, the garage plugged it in to their diagnostic equipment and it came up with something to do with boost pressure or boost leak, I can't remember the exact fault code, I have checked all the pipes going to and from the turbo and all seem ok.
Does anyone have any idea what this could be?, could the garage have broken something in the turbo while changing the cat?, as it is directly behind the turbo.
I would really like to try and work out what exactly it could be, it isn't smoking and I can hear some noise from the turbo but only when revved very high and not the normal sound it makes.
Any help would be much appreciated, lastly could anyone reccomend a decent garage around Surrey/SW London that would be good at finding this sort of fault because the one I used, while good for servicing etc don't really seem to know what it could be.