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Jannetty Racing did a test on this. There are no noticeable performance gains in using off-road pipes (no cats) over high flow cats. If you go with no cats it will sound a bit raspier (my opinion), and your car will smell (fact). The smell is unburnt fuel, oil, etc. Whether it will be too loud inside the cabin or not, that's really dependent on what exhaust you get. The cats don't really have much play in the amount of drone a system has.
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