Before you take out the cats, try a stage 1 VF tune. Its about 720 hp at the crank and very beastly-no smell, no codes with a nice burble. You may want to adjust to that extra power first, and then progress to a little more and remove the cats if you must. 560 hp to 720 is a big jump, and you will feel that for sure. removal of cats about 20 hp I hear and you will smell gas.
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