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All you need is the headers and gaskets, for the header install itself. What you do after it us up to you.
I recently did this install, and put high-flow cats in as well. I had dual exhaust before then, so that made it a little easier overall. I had custom downpipes made at the local muffler shop and ran them from the headers to the cats. No x pipe. Don't bother with mac's prochamnber or whatever it is they recommend for after headers; instead, just ge the downpipe and other piping made for the car, and go with 2.5" pipe instead of the stock 2.25"! You'll love this setup!!!
PM me for pics/details, as I dont have access to them from this computers.
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-- Mike --
2005 V6 Automatic, 300+ RWHP
Vortech Supercharger, air-air intercooler, blow-through setup; 42#s; maf.ia; 40mm BOV; PLX Wideband O2, VEI digital gauges, SOS pillar pod; JBA 9MM wires; Cobra 8.8 rear end, LPW girdle, alum driveshaft; Steeda panhard bar & brace, CHE lca's; Mac LT headers, high flow cats 
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