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If you go with catless DPs, I would recommend running secondary cats due to the fact the turbos smoke and the smell from catless exhaust is awful. I cut my secondary cats out and it was the worst mistake I make and now I'm in the process of putting them back on. Even with visual, if you have the secondary cats, the inspector is not going to fail your vehical for not having primary cats because they are impossible to see. Just get the O2 shim to make sure your car is in ready state.
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