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Yes you will still see gains even with an aftermarket catted DP because it still flows better than the stock cat. My hose reference explains it the best. Any free up in the restriction of an exhaust system (especially a turbo motor) will see an increase in horsepower.
Before I got my 550 2 weeks ago I had a 2012 mustang GT. Back when I deleted my cats before adding headers, i gained 20rwhp just from deleting them.
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