I welded my up pipe closed tonite on my 04. Wasn"t to bad of a job except I droped the bolt for the down pipe clamp and could not find it anywhere, started to take everything off to remove my turbo because I was sure it was under it. Once I got the air filter and everything out I decided to look one more time. I took off the heat shield off the Egr cooler and could just barley see it under the cooler, I had to fish it out with a magnet. That stupid bolt cost me about three hours. Also I thought that the 04's had the scoop in the up pipe, mine did not. I also took out my egr valve and welded it closed.