For those still running N/A, which is most of you, has anyone attempted to port their intake tract or header / exhaust area? I don´t know if these parts need cleaning up or not, just curious. If so, did you notice any improvement? I imagine that such clean-up work would be most noticeable when using forced inducation. I recently changed my valve cover gasket and noticed all the casting ridges, pits, etc inside the head. Wondered if the other elements might be the same way. Anyone?