This is just my opinion... I have both and have used both... Both have thier pluses and minuses... I like EFILive over Hptuners, but that is just my opinion... I will say this thou, HPtuners forum does have more traffic than EFILive, but all that traffic is not always correct... So IMO which ever one you can get at the best price is what i would go with... Both are great, it will be one of the best mods you will buy, period..