Yup that's why I gutted mine. Ford wanted $2500+ to replace them even though I was under the warranty.
They didn't diagnose my problem in 2 visits, so I had to gut the main cat. When they finally figured it out (thanks to me), they (Ford) welched on the warranty because I had no main cat. I fought with them for 1 week then gutted them.
As for only gutting the easy rear pre cat. I believe you will soon be gutting the front one.
More air is flowing out the rear bank now, I think this will cause some issues with the front bank
or you'll be replacing upper O2's sooner.
Did you make a MIL eliminator for the pre cat you gutted. You can also put
the O2 behind the main cat instead of a MIL eliminator.
If you didn't you will see a CEL soon.
1996 2.5LT V6 Contour ATX
My Tour+help/info pics
E0 rims, Gutted Pre-Cats,CTA Custom Exhaust & Intake, Diablo Chip.
