I didn't know it had that low of a gear already. A change to 4.56's from 4.11's isn't going to make that big of a difference, in rpm or performance. If you were running a 2.xx or a low 3.xx, like a 3.27, then it would make a difference in both.
So, I'd go for the supercharger. Headers won't hurt a supercharger, anything you can do to make it easier for the engine to get more air in and out, will help performance and efficiency.
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Rad Craig,
Induction Concepts
High Performance, Twin Turbo Systems
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