A new intake choice is the Sullivan manifold. It looks like a carb intake and is available for 4V 4.6's and 5.4's. Also the 03 Cobra heads (also 02+ Navi heads) arent a bad second choice to the 00 R head. The only big down side is headers. Basically you are stuck with 03 Cobra manifolds, but they do flow pretty good. These swaps will become more popular in the next few years. Ive seen used Navi engines complete for around $2000, the intake starts at $700. Plus a GT computer and harness can run it all.
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