Hey there i know this thread hasnt been posted on in a while, but i also have the same exact problem on my 2007 King ranch 5.4 4x4. My truck is completely stock except for si/do exhaust and the gotts mod. I bought a CS from you guys at php and put in before any modifications as well and noticed the drone noise as described above and it scared me and still kinda does. I havent tried the level 1 tune yet but level 2 and 3 do the same thing and it does not do it on the stock tune.
I am really interested in getting a custom tune, but i just dont know how much it would benefit a truck that hasnt been heavily modified, but if it would fix the drone it would be worth it. I do tow a good bit especially during the summer and i do have 3 inch piping from the y-pipe to the si/do muffler would a custom tune help take more advantage of the exhaust modifications?
thank you for your help
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