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Regarding the gasket question, ONLY use MLS (multi layer steel) gaskets! I used the the ones that came with my Pacestters and within six months they were blown in seven different places. Won't make that mistake again.
I've had eBay headers and kooks. Like them both...for the price I the eBay headers are great, but with kooks and their true duals, I never wonder if I am leaving power on the table.