i have been told that if you remove the cats it will mess up the computer

 

It expects a certain reading from the O2 sensors in the cats, get some simulators for 'em.

 

You guys want to hear something funny? Well, a few days before I got my h-pipe, I was driving home one night, and all of a sudden, I hear this loud ROAR! I thought there was an airplane buzzing me it was so loud! I come to a stop, and the sound goes away, turns out that my mufflers broke off the rest of the exhaust and were just hanging there. Man, it was loud, I thought I was gonna get hit by something. <IMG src=smileys/smiley1.gif border="0">