i'm just gonna do it, wondering about rear cats and just got mixed responses from people, so i guess ill just be one those who has to do it and just find out, hay sometimes u just gotta do it to find out for urself. the worst that could happen aint that bad, so monday i'm cutting the back cats and hoping for the best.i think i got it though as long as a code dont come up for the front sensors i'll be just fine i believe!!

 

yea i gutted my fronts on my 03. left the rears alone. no codes, 15k 1.5 years

 

I don't know a whole lot about this kinda thing, but I'm trying to learn. see, i thought if you cut the cats out nowadays it would screw with the o2 sensors and the truck won't run right. No? I learn something new every day!

 

Sometimes they trip a CEL sometimes they dont.. I have seen mixed reviews on the results people have..

Even if you do trip a code you can get these:http://www.rpmoutlet.com/gmo2s.htm

 

I offed my rears at one time and didn't touch the fronts - no codes. I would have did what Patrick did , but I didn't want to snap my flang bolts in half..