Ok, here is my problem; i bought a 1/2 system for my 04. I wanted to get rid of my EXUP because reading on here, it has been said it acts like a header. I did a search, read up, but now i am asking for opinions on if this really works from member who have done it. If so, how did you do it: block off plate, or wire the valve open? Which is better to do? Does an error code come up? Thanks for the input.