Exhaust
And if by "stock headers" you mean the stock exhaust manifolds, I wouldn't personally do it. I'd do it off of some long tubes though.
Definitely don't think going over the axle is a trivial task either...look around on here. This topic has been beaten to death every other day...
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And I don't see how it would be more expensive than doing true duals over the axle unless the build quality isn't up to snuff. It is more difficult to do than it looks, unless you remove the upper panhard brace, which just isn't smart in my head.
Best thing to do is set your price range and then search the forums and the sponsers, you should be able to find the setup he wants or something very similar. Good luck


