no cat spark plug de fowler
 

just like it says i have one on there and i still am throwing a code... anyone else have this problem? i would get a tune but i dont have anyother mods but intake, exhaust, sts, and an intake.

Do you just have one on there or two? You're supposed to leave one as is and drill one out to fit the rear O2, then put the drilled one directly on the O2 and the normal one on top of that, then the whole thing into the pipe.

If you've done all that, it shouldn't throw a code even if you're catless. If you have it like this already, get the code read. You might have a different code entirely.