Originally Posted by BLKROKT

If you guys are really serious about not running cats, Google "O2 sensor simulator". I built one with a couple of capacitors and modified it so that the ECU was tricked into thinking that the rear heater O2 sensor circuits were still within spec (even though my rear O2 sensors are completely removed - I used the bungs for my wideband AFR gauge). For "off-road use only" of course, I don't encourage breaking any laws here.

Originally Posted by c63panda

Got a link? I found ones that keep the o2 attached