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Old 02-10-2007, 07:45 AM   #2
FrayAdjacent
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Join Date: Dec 2006
Location: Austin, TX
Posts: 939
Well, an old catalytic converter ('cat') could cause flow issues. Backpressure, some people say, helps low end torque... but it could be hindering your engine's ability to breathe well.

Could be that your old cat was not flowing well, which would cause a reduction in horsepower, and a reduction in fuel economy. After all, the engine does have to work to push exhaust through it!
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