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I went with the patriot heasders sold on here.. As for cam I went with a moderate .581 .588 220 228 116+3 lsa.. With ls6 and those performance upgrades with springs and all the other necessary mods you should be 525+ easy... I'm waiting on my dyno numbers as its at the tuners now
You will have many different answers.. Basically unless you have a prefrence your most likley going to choose what most others do.. Goodluck
Any of the name brand headers will be fine Kook's, ARH, LG, Stainless works, ETC.
Your stock cam really makes a pretty good blower cam so if you want to save some $$$ just keep it.
And invest in a ECS meth kit.