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Hey whats the best type of 3 inch aftermarket cat to use in order to keep the CEL off?
They're all going to trigger a CEL. You need to either put a spacer on the O2 sensor or your ecu needs to be overwritten.
 

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Hey whats the best type of 3 inch aftermarket cat to use in order to keep the CEL off?

Depo Racing's (APT) 3" High Flow Cat is nice and comes with the O2 sensor spacer already welded on the pipe for you...presto, no CEL. :rock:
 

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One thousand give or take a hundred...
Lmao!!!
Thanks and would you happen to know if high flow cats cause the CEL to come on.
Obviously, just like in all other cars. Thats the purpose of the cat. Im not aure if its possible to do it with this car but what i did with my Si, was i bought two... Its hard to explain but long story short try to ge the O2 sensor a gap between the foul exhaust and the sensor with two small tubes? If that makes any sense
 
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