Randy, I purchased a 2006 with 500K mile in 2010, and was disappointed with the MPG, so did the EGR delete, and at the same time, did the weed burner thing. Ran a straight pipe (a few bends & turns) with a turn down @ about a 1/3 turn. Removed the donut still got 6 1/2 MPG, and no change in power. I think the slight turn really helps with the dust, we live in the country, and 3 miles off the payment. After a year or so, I had to replace the cooler ($$). So, I removed the plug, but retained the weed burner. I'm 76 years old now, and can't hear so good, plus I had back surgery 12 weeks ago, soooo, I'm now in the process of reinstalling the stack. I saved everything, muffler, brackets, etc., but everything seems much heavier than it did 9 years ago. I hope after the reinstall I will be able to hear the "Top dog" better. OH WAIT, is that a good thing?? BTW, I was surprised your 2004 had a EGR, I didn't think they had them until 05, or 06 at the cost of a mile or two MPG. Good luck with your truck, and your back as well. Dick T