You don't need to write the VIN to the cluster, the cluster will pick it up once plugged - you can ONLY increase the mileage with Forscan (you cannot decrease unless you've got another tool called UCDS or eeorom programmer)
I'm almost sure that you guys can get rid of the hiss by grounding the ACM, Ford quality is shit.
I have a hiss too, but haven't tried the ACM fix yet.
Take a look at my setup:
Sorry to storm this thread but I was using Maestro AR with Audison AP8.9, but eventually got rid of the Maestro AR as you'd need to flash the Audison amp with a custom firmware for it to work with the Maestro and this firmware makes lose tons of features of the amp.
Anyhow I'm also experiencing...
SSM 46767 - 2015-2017 Mustang – 3.7L/5.0L – 6R80 - Clunk/Ping Noise When Shifting From ParkTo Reverse And/Or Park To Drive Engagement
Some 2015-2017 Mustang vehicles equipped with 3.7L and 5.0L built on or before 1-Apr-2017 equipped with a 6R80 transmission may exhibit a clunk or ping noise from...