6.4 tun Just curious, what kind of gain(s) do you feel you've gotten with the tune? Are these drivability gains, ie, being able to get higher throttle gains without the constant transmission kickdown or just WoT gains? I'm looking for the drivability gains only as towing heavy a good deal of the time. Have regeared from 3.73 to 4.56 but am still stock on exhaust and intake. I really don't appear to be lacking on stock due to the fact that I don't need or want the wot or high rpm for my usage. Considerably better after gearing but being able to get a slightly higher throttle before a downshift would be an improvement for me. Thanks.