So the Needwing exhaust deletes ALL 4 of the cats? I think I will start out by removing both of the 2nd set of Cats and removing the Resonator. I have had Race Cars on the Street and really want to keep this car civil. I can have my shop replace the rear cats and Resi for 75.00. I did the 2nd cat delete on my NA coupe and it did sound better and picked up some low end grunt. Thanks for the input.