You should help your friend out by blanking of his exhaust with a large vegetable.... Helps hold boost pressure then he mite run 300+bhp!
On a serious note garages hate forums because people read the first line on a subject then go into the garage saying

- this is what I need, this is how to fix it, I read it on a forum.
Then the garage guy says..

- fix it yourself then if you know soo much!
So everyone's kind of in the wrong in my eyes because if your going to take e time to research it and there's usually a pretty simple to follow and good guide how to do things, just try it yourself ha
If your really not wanting to find a good garage and leave them to it.. There may have been a million issues they had to overcome to solve a simple problem.
Rant rant rant rant