You can order o2 sim. from http://www.o2simulator.com/
for $30 shipped, i thought i would just share with you guys...

later

 

Does it come with good directions, on which wires to splice?

 

Or you can go to Autozone and get two gasketed 18mm antifouler extensions, then drill the outer/back one with a 1/2 inch bit and never get a cat inefficiency/slow rear O2 CEL again for only $4!

 

Does that work with a stock catback? I have a Helix Test Pipe with similar mechanical fix and a stock exhaust but I still get the CEL. My theory is at full throttle I think the stock catback creates more backpressure and exposes the 02 sensor to the gases it normally wouldn't see.

 

no its not due to the stock cat-back. i also have the helix testpipe along with the a down pipe and cat-back and still get a CEL. i am going to try the anti-fouler covers to see if it will work.