Originally posted by NWLee
Two things to do to upgrade your exhaust; first port your manifold so the port on the engine matches the opening on the manifold, and second plug the hole on the bottom of the pipe with a screw and drill new hole on top for your pressure line, or else all the half burnt fuel/oil mixture will end up in your fuel tank. Tapping the hole is best but I just screwed the fitting in and it seems to work fine.
so if i do this way, i won't loose any performance???