where can I get a downpipe?

I am doing an custom turbo install. I need a downpipe for a t3/t4 turbo in a 1991 civic si hatchback. Does anyone know of a repitable website that has something that will work or dose anyone know someone who might? All most ready to boost it!
thanks,
djK1

It depends on the kind of header you have. What brand is it?

It came with a package deal, I don't know who made the manifold exactly, but there is no external wastegate flange.

I personally would have it taken to a speed shop that does custom jobs and have them make you a dp for your application.