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The only difference I see is one has the AIR fittings and one doesn't. Both are painted and not coated. Spend a few more $ and get the Elites, they have thicker tubes and flanges and they are thermally coated. http://store.summitracing.com/partde...5&autoview=sku
I installed the Elites and the only issue I had was, I needed to move a wire bundle to the other side of fuel lines to keep it from contacting header. The ball and socket collector adapter is very nice. Allows for minor misalignment of Y pipe and requires no gaskets.