with today's engineering & cat technology, i doubt removing the cats would do anything but hurt performance unless you're really doing some work to the car.
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Eve ('00 FRC): hot-air intake
Rowan ('09 H3): 5spd mom-mobile
Penny ('99 Sierra): 5.3 / HD 5spd... gone but not forgotten
Samson ('18 HD): compounded 408
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