Originally posted by Pete D:
Originally posted by ScottK:
O2's only check the health of the pre-cats - and gutting them wont make the cel go away.

--edit--

Sorry I always think V6, zetec O2 will check main cat, but again gutting it will not turn off the cel



I know it won't turn off the CEL but I figure if I have to look at the CEL I should at least get the extra 2-3hp from not having the cat at all.

-Pete


You are losing power with the CEL on. I have the dynos to prove it as well. IIRC, I lost 13hp and 8lb/ft torque. Also, how do the O2 sensor check the secondary (underboy) CAT? My O2s aren't after it, but before it. They primarily measure after the main (exhaust manifolds) cats. I too have gutted my secondary CAT as it was so clogged, the car would start to stall. Once gutted, the car was able to exhale again and some power was freed up. I know that I am making all of the power I could as the shell of the CAT is causing unwanted turbulence with the exhaust.

Chris NJ 98.5 SVT Silver Frost