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Good info on cats
http://www.randomtechnology.com/technical.html

 
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I think too many people look too much at the cats and think that they are the key to making horsepower. Often times you can have a car that meets emissions and doesn't hurt horsepower.

I think its the least we can do as car guys is make our cars legal to try and change the image that we have.

 
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exactly, kind of like the moron that I got my car from, had deleted the egr, and when I bought it it had been replaced, but not bolted down so I had to fix it. EGR doesn't hurt hp one bit (and I did find it helps gas mileage enough to see it)

 
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anyone know who makes emission legal headers that have the precat and 02 sensor bung hook ups? Ive heard minimal gains with the slp cats.

 
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there are minimal gains over current stock ones due to the fact they are already high flow, the only reason to replace a cat on a car that is obdii compliant is failure, and even on the early 90's cars the cats flow well

 
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yea there was a said, 1hp gain on testing several cars from what I have heard.