Drone sound I think

[rdemo84]

The sound is there but it is not unbearable. I will continue driving with the 87 tow. I was just concerned it was something harmful. Thanks for the help

[RoBatt]

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

[Longshot270]

Hopefully the OP will post up results. Unfortunately I'm going with a harmonic vibration theory and it just happens because of a variety of conditions lining up perfectly to cause standing waves.

Your exhaust modification doesn't need any kind of tuning because the "y" is still intact.

[tmsbandman]

FWIW-I noticed exactly the same thing with my 2004 SCREW. It is not there on my 87 Custom Performance. I was just guessing it was something to do with modification of the timing for the tune.