"Also, if the manifold was made from carbon fiber or phenolic (sp) to provide heat isolation .. that would also be of benefit. Thoughts???"
I'm not sure if the intake design could be improved or not but I agree with increasing heat isolation. I was considering sending my intake to Swain Coatings. They will coat the underside of the intake with a thick heat barrier ceramic coating for about $125. This may well be worth a few HP.
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Dan
99SVT - Tropic Green
#554/2760
Stock - except minor intake, exhaust, & motor mount enhancements
