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Nice exchange on info and perspectives everyone, thank you! It seems to bear out what I've heard that the OEM exhaust manifold is deficient from a performance perspective mainly due to the less than optimum merging of the exhaust gases before they're routed into the cat, hence the torque dip that gets reduced/eliminated once a header with a better collector is in place.
For my purposes, I'll likely eventually end up with one of the CARB certified centrifugal superchargers and will be swapping back in the OEM manifold/cat every 2nd year. That may also mean I'll need to reflash between two different tunes once ever 730 days if I want to fully maximize the non-CARB setup (or not if there isn't enough difference to warrant the cost of a 2nd tune). The good news is that here new vehicles no longer require a smog inspection/certification until they reach six years old.
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