>Unless your stock cat is clogged,I'd leave it on. Nissan cats a quite large
>internally.
Well, that's exactly the issue. With 135K miles on the car, I'd be surprised
if the cat is not at least partially clogged. Furthermore, if I have the
entire exhaust at 2" diameter, it's seems like leaving the cat at stock
diameter would effectively make it a restriction. In any event, cats do "run
out" eventually, so replacing it makes me feel like less of a gross
polluter, so I figure I may as well do it.
JWolfe
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