I keep having problems with my cats, the last time I had to replace them and it cost $1200 each from the factory. Has anyone removed their cats? If so what problems did you encounter. Obviously, engine codes and emissions workshop warnings, I figured that much, but I was wondering if anyone has seen or found O2 simulators for VW or anything, Any input would be appreciated. I'm not ignorant about cars, I just don't know how difficult it is going to be to find away around my problem. Thanks for your help in advance. 01 passat 30V V6.