>If you get a aftermarket cat. or hollowed
>yours out is there any power gain or just a deeper growl?
Traditionally, catalytic convertors were fairly restrictive, but in general
this is not really true anymore unless you are talking about a high-boost
turbo-charged car. Modern cats are much better than they used to be, and
Nissan cats in particular are very non-restrictive. Especially on a
naturally-aspirated, bolt-ons only engine Nissan vehicle, you won't see any
gains by gutting your cat or switching to an aftermarket high-flow unit. The
only exception is if your current cat is clogged or melted. As for sound, a
hollowed-out cat might act as a sounding chamber and give the exhaust note
more of a growl, but I can't personally confirm this. Get a cat-back exhaust
with no resonator and a good straight-through design muffler and a cold-air
intake if you want some growl and noise.
In any event, please don't hollow out your cat--for the tiny gains you might
see, the added pollution is not worth it.
Hope this helps,
JWolfe
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