No cats! Still no "check engine" light!

actually it is very possible. I've had my prochamber on my car for about 5k and still have never thrown a light or code(checked with my predator and no i never used my predator to turn off the light because i wanted to see how long it would take to trip the light)....the mustang shop that did my car said about 15-20 percent of mustangs will not throw a light

Same here, but my X has only been on for a week. No sign of a light.

most people just think it def is so buy the mils or whatever right away so they dont have to see the light.......i say buy them when they go on if they do

It will come on. It can take months before it pops up.

Maybe your rear o2 sensors are just broken

Milenko said:

Same here, but my X has only been on for a week. No sign of a light.

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After reseting mine, it can take a week or two for it to come back. just wait, figure about 50-350 miles.

My light came on like 3 miles after I first put it on (before I had the MILs and O2 extensions). lol