Have you checked out Incon? They have an awesome twin turbo kit for various mustangs. They make unreal power and they come with everything (fuel system, injectors, wires, intercooler...everything). The only thing is that they require a little fab work in the engine bay (cutting a notch in the frame-rail to be exact). There are a couple of guys running them on this board. I would have one if I had the $$$.
--nathan
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--silver_pilate
'91 GT, Built 306, Wolverine 1087 cam, ported Windsor Jr. Irons, and all the goodies...click the link to the left to see a full list of my mods...
Tried and True 302 Being Built to Outrun You! heh heh heh...
--Texas Panhandle--
Check out my site