Headers or Intake?
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+ 1 for headers. If you put headers, LS6 intake and a tune this is what you can expect for a gain... I literally just did all three not to long ago and made this vid.

http://videos.streetfire.net/video/B...des_721304.htm
Note: Headers are for CAMMED CARS in which more air flow is required.
I did the intake manifold first because it's an easier job to get done, and still worth it...not as much of a gain as headers/exhaust, but it was still very noticeable.
Back in the day, I had a '73 Impala with dual exhaust. When I added headers, it got quieter. Headers have the propensity to absorb sound more than stock manifolds.








