Well, this is gonna be my next project for the Crossfire. It will probably take me a really long time to complete due to the fact that classes just started up at CSULB.
I just ordered the simulator from:
http://www.o2sensorsimulator.com/
It only cost me $24.99.
Next I'm going to have to order some stainless steet pipe from Mc Master Carr, sorry no price on this yet, I'm guessing it won't be cheap, nor will it be easy to make with out having a nice 2-4 post lift.

I'm also gonna remove that one smashed oval pipe that Y's into the resonators.
It's too bad I can't get paid to do this stuff...

To be continued...
Here's the wiring schematic: