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Cats for off the line torque and catless for topspeed. The catless hookers for the lfx are an inch or two longer than they need to be to connect to the factory intermediate pipes. hooker states that their DP's only fit onto hooker's cat back systems which is not true. so hooker makes two different catback lengths. the OEM quad lfx cats do 80% of the muffling. I currently run trifecta tune and the hooker catless DP's into oem intermediates and factory mufflers with the central brillo packing removed egypt mummy style. It rasps at 3k rpm. Swap the DP's without tune will throw p0420 and p0430. If I had a chance to do it all over again, I would just delete the secondary cat and remove the brillo in the factory mufflers and not even need the tune. I assume the ARH DP's will need a tune.
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