Stopped in at Mazdatrix today to pick up a few parts
and John showed me his latest six port porting work.
This is very relevant to the RX8 as it too is a six port
design. Mazdatrix charges $350 for a set of end and 
center housings. Probably worth 30 or 40 HP at 
6000 to 6500 RPM. With the right manifold of course.

Paul Lamar
 
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