A friend of mine has a 20g that I might be able to get my hands on cheap. Problem is that it is off an RX7 rotary.. meaning it has a huge exhaust housing. What are my options here? I was looking at the Bullseye stainless internally gated housing, but also wondering if it was possible to use a 14b hotside(but thought that it might be too restrictive and negate any gains).

Would the exhaust wheel fit in a 14b housing?

What turbine wheel is on the 20G?
That should tell you which mitsubishi housing will work.

I haven't seen it yet, but apparently it's a Hahn kit that uses the 20g with a special exhaust housing for the rotary, manifold, and external wastegate setup. I might be able to find it online.

If it's a "big" housing, it's probably a TD06, and 8cm or larger housing.
I'm not sure what (if anything) is available in the DSM bolt pattern for TD06.
I'm running a TD06 with a T3 flange, via a trick adapter plate. It's work.

Thanks Rob. I was only considering this because of its availability and price... but really I would be happy with an EVOIII 16. Think I'll just wait and pick one of those up. Wasn't really planning on much more than 300 hp or so and the lag would bug me.