hey old friend, I have been out of the loop for a while, ? for you I have a 2001, I have a code P0422, getting bad gas mileage, I had a dirty air filter, K&N, I cleared the code but it came back, do you feel I should replace the front cat ? I have a man trans, I found one on ebay for $149 it has gaskets and the 3 new bolts. thanks bro. John