The effective place to mount the cat is as near to the exhaust manifold as
possible. It need the heat to cause the chemical change over to a cleaner
exhaust gas. If you have an air pump and hook it into an air inlet the extra O2
will cause an even cleaner exhaust. The further away from the heat source the
less effective the cat will be. That's functionality.
As far as fit goes, there is more room back near the rear axel for fit
purposes. Up near the front you will ave to check clearances. You run the risk
of fire if not It all depends on the cat you use. Mine was a small flatish one
that I installed in the rear. My year spit didn't visually require a cat to
pass but it needed it for the sniffer test to pass.
Rob
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