FWIW, the people at Racing Beat said that the Renesis is a very different animal than peripherial exhaust port rotaries when it comes to exhaust systems.  As I recall, they said they got only about an 8 HP improvement when going from stock (RX-8) exhaust system with cats & the works, to a full race setup with headers, race mufflers, etc.  That is TINY in comparison to the earlier engines.

 In other words, the Renesis is very non-critical when it comes to exhaust systems.  Just keep the back pressure down and you'll do pretty well.  At least that was my conclusion.  Note there is zero overlap in intake / exhaust cycles in the Renesis.

BTW I'm still waiting for someone to build & test a peripheral intake port Renesis.  I think that would be a great setup for aircraft applications. 

Tracy

 

Another way of saying that same thing is: The Renesis exhaust ports are so restrictive and so poorly shaped, (to avoid any overlap) and result in an instant 90 degree turn to get out of the iron, that in stock trim a good design exhaust system will go unnoticed. The shared center port complicates things even more. All to keep the tree huggers happy.

 

One wonders what a mildly ported (intake and exhaust) Renesis could do on the dyno. Or, in an airplane.

 

You would want to cut the rotors for 3MM apex seals and springs to go for the periphery port.

 

Lynn E. Hanover