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I had Catless Speed Engineering headers on my Yukon and the fuel smell was bad on pump gas. The headers were also junk. So I ordered a set of ARH with high flow cats and the fuel smell is 75-80% reduced. It's the only way I would go with pump gas. It didn't lose any power either. On a NA setup you will be fine with standard high flow cats imo.
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2016 NFG SS A8/Whipple 2.9/Fuel System/Flex Fuel |