Parts source?
I've bought a few things from RPS. Lines, fittings, elbows, couplers, etc...
http://racepartssolutions.com/
Bought my Master Power turbo, Waste Gate and Blow Off Valve from VS Racing.
http://www.vsracing.net/catalog/
The piping was bought through Colombia River.
http://www.mandrel-bends.com/catalog/
That should get anyone a good jump on sourcing parts.
BTW. Everyone of these companies are a sponsor on The Turbo Forums so they are reputable shops and many people have used them without issue.
By experience with them was good. Columbia River sent me a pipe that the opening was bent slightly so they didn't charge me for it. They called and informed me of it before it was shipped out.