I think he means Rotary motors eat Piston motors for lunch....I disagree but i think thats what he's getting at...Originally Posted by hayashi_1986
OP - did you change the cat when you did the exhaust or just the section after the cat? Is the new exhaust greatly larger than the original? Sometimes when the exhaust is much larger the gas velocity is increased which in turn results in the catalytic converter taking longer to heat up and burn off any excess fuel.
On the other hand, if you changed the cat to a high flow unit then there is a good chance that it simply isn't working as efficiently as the original cat at lower temperatures.
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