Custom Turbo Kit

I am looking into building a custom turbo set-up as I have found it will be cheaper in the long run, rather than buying one of those stage 2 kits to get any power....I pretty much know where to obtain most materials, but the one thing that puzzles me is getting headers custom built...basically the tubing....anyone know of a good place that I could work with on that? I'm not talkin just building a kit to fit on a stock engine either, I'm considering serious power down the road after I get the engine built up next summer after warranty runs out.

A good header shop in your area can make you a custom turbo header if you wish, but Johnny Mack over on j-body.org already makes a great tubular turbo header for the ECOTEC, I suggest you try to get into contact with him as I'm sure it's much cheaper than bringing an exhaust manifold flange into a shop and have them custom-do the work...

Thanks for the info