Calling on 986 Forum Master Mechanics

[Tweetdriver63]

I know it's been a few years since anybody posted to this thread, but I have a question.

According to what I've read here, and what my Durametric tells me, both of my cats are excrement. The sensor voltage behind both cats is all over the place. Before I go spending a bunch of money, can I tell from Durametric of the sensors giving me those readings are good? Resistance on the sensors on both sides shows basically zero (steady) behind the cats, and both show a steady value forward of the cats too (sorry I didn't note the actual values forward, but with both bank's showing, the line for the value forward of the cats showed both at an identical value and unwavering.

Is that how good sensors should read?

And BTW, which cats are we actually talking about? The ones that are part of the exhaust manifolds, or the ones downstream, just prior to the muffler?

Also, since cats cost as much as they do, I'm thinking I'll just replace the system with a Fabspeed exhaust from Pelican Parts. Specifically, Pelican Parts part number FAB-986-MAXKT-M. It looks to me like it replaces everything aft of the exhaust manifolds. If I replace the entire system, including replacing the OEM manifolds with headers (eliminating those cats), what problems am I likely to run into? I don't care about emissions, since we don't have emissions testing where I live. More interested in what effect that would have due to (i'm guessing) eliminating the O2 sensors in question.

Anybody here have experience with the Fabspeed exhaust?