Using O2 Simulators

99Silver6.0 · September 20, 2005

The rear 02 sensors have no engine control functions, strictly monotoring. They are there to monitor cat efficiency, but if they set a code, it will affect engine operation. The front 02's monitor the AF ratio and send the info to the PCM.
The sims will work fine. Another option is to turn off the rear 02's with a custom tune.

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Ditto. Rears only relay cat efficiency and cat over temp.

Meatywand · September 21, 2005

welp, I deiceded to redo my entire exhaust since the tips were really rusty and I needed new hangers anyway (man mudding tears stuff up) So I ran straights from the manifolds to the crossmember after the torsion bar one, then put in two glasspacks and dumped it out about a foot under the bed sounds much better, my gas mileage is WAAAY better than with the clogged up Cat, and if feels a little torqueier than before, and the sims went in in about 5 minutes and everything is running smooth now!