I just noticed that Greddy has come out with a Turbo Kit for the RX-8 with a cast manifold.....

 

You could probably get the manifold separate and use it as a solid place to start on an exhaust system, of of course bolt up a turbo on a renisis engine...

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Dave Leonard
Turbo Rotary RV-6 N4VY
http://members.aol.com/_ht_a/rotaryroster/index.html
http://members.aol.com/vp4skydoc/index.html