I installed my new AFE stage II intake this weekend, and while I was at it I decided to do the foil delete. I have seen a couple of threads asking the best way to remove the foil, so I thought I would include my 2 cents. I pulled off as much as I could by hand, a utility knife helped get the edges started. Once I had all the foil and most of the insulation off, I went over the entire pipe with a wire wheel on my angle grinder. That removed most everything. The only stuff left behind came off easily with Acetone and a rag. Start to finish I would say 15 minutes.
I also have my stock air box if anyone is interesed. I am planning on tossing it but would rather see it go to someone who needs it. I don't want anything for it, just cover the shipping.