I think I have searched and read every post about both of these but I would still like to hear from people who have purchased either one or both and what they feel is money better spent. 06 5. 9L, 35K, auto, mega 4x4, afe stage 2, 5" exhaust no cat, 3. 73 gears, no gauges. I only have a certain amount of money to spend so I can't have both. I pull a 7-10k 5er half the time I drive it and the other half is long trips empty, I would like a little better mileage of course. And if someone could explain to me what they each do that would be great also. I have read the edge is fuel pressure and the smarty is timing and boost, please correct me if I am wrong
Thanks in advance for your response!

Thanks in advance for your response!