Just looking for a lil bit of information on my 04 760li. I've been getting a low catalyst efficiency code for a couple months now and think i need to address it before it progresses into a full time problem. I'm guessing that i possibly have converters that are plugging up. car has almost 140000 on it now and i have driven it since 80000. I'm wondering if anyone has removed the converters and put a pipe in place or even gutted the cases and if so what kinda issues did it create.. Also is there a way to fool the o2 sensors if i did remove them. Ive used the spark plug antifoulers trick on chevy vortecs to cheat the o2 sensors wasn't sure if the same thing could be done here. Thanks