Well I have been on this long debate on whether I should remove my headers or not for inspection purposes, and Jim Jr. at JDM suggests it would be better to just put the stock system back on, as they have had problems even with metallic cats not passing. I am not sure 100% how this works, but I believe when you go for an inspection they check through the OBDII port and it checks to make sure all the 02 sensors are working properly and making sure your car isnt throwing any codes.... any suggestions on how to pass or even if I find someone to "help me out" will he actually be able to pass me?