If its on a non street car then it shouldn't matter to you what other people do. I'm sure most track cars don't run "damaged" cats, they run straight pipes according to what the competition rules allow.
Unhindered exhaust passage is obviously better for engine respiration than one with cats and mufflers in it.
Thread closed. We don't encourage discussion of illegal mods, nor popularity contests for who has them, so please use fastfours forums or nissansilvia to post up redundant polls like this.