Has anyone here run a turbo set-up from http://sd-concepts.com/ ?

I've been contemplating boosting my GTA for years now and came across these guys... I was actually looking for the turbo headers because I don't think that I could make something strong enough...

After a quick inquiry, they got back to me and said that a whole kit starts at $5100.oo...
And headers and downpipe could be had for $2500.oo

Jeeez....

They sent me a pick from the front of the engine, which I think that the twin turbos sit too high... Woulda liked to see how the manifolds were built...