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Oops, I missed the change to 1.0 from .86 on the turbine housing. I would have thought that going larger on the AR and dropping the cast manifold would have dropped the EGTs more.
My ports are from a Judge ITO template.
My thought on the exhaust port is to smooth the bottom and sides for more flow but on the upper/closing side to duplicate the stock Mazda sharp step and possibly adding a second step at the beginning of the sleeve to help discourage reversion.
If you notice F1 headers (and others) use reversion cones every few inches on the exhaust headers. An idea we need to incorporate.
Barry
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