Ok now we have a little bit more info.

Your External WG has to be mounted on the Exhaust Manifold before the Turbo.

What Turbo Kit are you getting installed???

What kind of Exhaust Manifold do you have???

Does it (Exhaust Manifold) have an External WG Flange on it???

Now this is what I would do if I'd be you;

I'd ask them where exactly they are planing to mount the "External Waiste Gate". I would then take my car out of that shop if the say after the Turbo. Plain and simple.

Their is a lot of good DSMer in your area. I'm sure that someone could help you with this install instead of dealing with these hack.

Hope this helps.

Ghislain.