efi live
#2
What year is your truck? V1 will only work up to 06 and some 07's. I always recommend V2's, They are SO much more capable.
#5
You can use either, as they both use the same software which you can DL and play with from here, http://www.efilive.com/download.aspx, they are just different interface cables. I would also recommend a WB. I can make you a great deal on a combo of EFILive and Innovate WB. Let me know if you have any questions.
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