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Originally Posted by NJSPEEDER
and on that mustang did they do anything else to compensate for not having the cat there any more? take out fuel? add timing?
maybe f-bodies just have a better response to getting rid of them since everyone seems to pick up enough power to add at least 1 full mph to their trap speeds, even with out tuning.
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Tim, you keep comparing to stock cats and that's not the point I'm making. All your examples except for your car were people removing a stock cat. Every car will pick up power removing the stock cat, but a high flow cat will make almost the same power as no cat. You can lean it out and add timing to pick up 5 hp but your motor will not last very long as proven by all those guys who lost their motors. Your car was tuned for no cat so you added a high flow and damaged it with a too lean mixture, then you blame it on the cat. The Chevy High Performance test I quoted above was done to make maximum power so I would think they tuned it without the cats and with the cats and made the same power. There have been lots of tests done showing virtually no loss of power. Your car was not a real test because of the way it was tuned. A catalytic converter is a normal maintenance item and when it has high miles it won't function like it was new. So replace it with a high flow cat and stay legal. Tune the car for the high flow cat. You change plugs, wires, air filters so change the cat.