Just wanted to give a heads up. Purchased some 9000xl's for my '03 Avalanche today and found them for under $90 apiece at Rockauto. There's also a 5% discount code at http://www.retailmenot.com/view/rockauto.com and Rancho is doing their rebates again. I am not affiliated with Rancho or Rockauto...
Doc Whiskey, thanks for the update. I think I figured it out. It looks like it was taken at the border on Hwy 97 just north of Dorris. I'm hopefully going to be passing through there again next year. I haven't driven that part of 97 since 2003.
If you are still looking at a new intake you might want to look at this. It comes high;y recommended from FTE.
http://www.riffraffdiesel.com/mm5/merchant.mvc?Screen=PROD&Store_Code=RRD&Product_Code=RDP6637&Category_Code=FOBS-IN-6637