Steve... Im going to hit you!
You cant remove any of your cats without getting a CEL... You can remove the secondary cats IF and ONLY IF you have ROW settings flashed into your ECU or have revo flash your ECU to ignore the input from the last sets of o2 sensors.
If you look at the image, the cat on the right side has an O2 sensor screw in behind it so its expecting cleaner exhaust.
This is where the o2's are bolted to my exhaust on my 2.5.
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