Let me know if you have come up with the solution to this problem. My VX has been triggering the same codes since I put the supercharger on, just not as frequently as you are. I replaced the MAS when I got a low reading on the MAS. Seemed to be OK for a while and the other day it set off another code. I have noticed a strong catalytic converter smell when I drive at highway speeds, about 65 - 80 MPH. This is also when the code seems to go off. The car will hesitate under accelleration and idle roughly. I am pulling my hair out trying to figure this one out. I have checked all vacuum lines and ther appears to no vacuum leak. I would appreciate any help or suggestions you come up with.