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If you have an 02, you can delete the secondary cats with no effects on CELs or emissions (provided your state merely scans the OBD-II port for errors). The pre cats are in the headers, and the O2 sensors are before and after these.
I am trying to for the life of me to figure out why the MaxSpeed NHP exhaust is using two cats, the first of which are in horribly designed headers.
Heck, if you're interested, I have a FabSpeed exhaust sitting in my basement I just got back from FabSpeed re-polished with a new midpipe under warranty you can throw on your car which will get rid of your secondary cats and give you a great sounding exhaust. Half the price of retail, PM me if interested.
Patrick
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