From the sound of it, it sounds like this proc. would be very likely to cause clogging in catalytic converters. I am dying to try it, but I am a bit hesitant at the same time...! Like I said, I used to do this on my Camaro using a windex bottle spraying only small droplets of water into the carb, which made a moderate amt of smoke. I wonder if I was using a negligable amount of water that didn't even do the job properly, as I did not get a coffee can 'o sludge out of that 350" motor.