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MZHUN,
I am currently running Trick Flow twisted wedge heads on my 5.0L. I am very satisfied with their performance. With regard to changing headers it will depend on the heads you choose. If you use the TFS high port heads I believe you will indeed need new headers, however I was able to use my existing headers with the TFS twisted wedge heads.
P.S. Looks like we are in the same neck of the woods - Kennesaw, GA.
Greg
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