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To the OP, what everyone else has failed to notice was that all you are really concerned with is sound. Am I correct in saying that?
If that is correct, don't bother with headers, just buy a axleback or catback exhaust. That's where most of your sound comes from. The headers do make the car louder also but not like a good axleback system.
Unless you are dead set on getting headers, I'd look at the back section of the exhaust first if warranty claims bother you.
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