I like both. I think it's probably cheaper to mod the 05 though. My local performance shop is offering the ford racing hot rod cams for $1200 installed/tuned for the s197's. It costs a TON more than that for a mach, and I also like the blower setups better on the S197 how they have a separate belt for the blower.
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Just some bolt ons and bolt ins by Manley, JE, and Vortech.
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