Oh, btw. Installed 3.55 gears in alu housing - no problems whatsoever. Upgraded to Wavetrac diff at the same time.
I'm going to swap gears again soon - 4,09 this time!
Coplus lowered the price. The wanted 400 EU from me which is 475 USD. What a bunch of cheaters...
http://www.ebay.com/itm/2015-16-17-Ford-Mustang-turn-signal-bumper-light-Sequencing-one-pair/182407481618?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m1438.l2649
You have a BCM config problem - nothing wrong with OPT7. Ford did a crazy current control in those vehicles. Both of you problems can be fixed with ForScan.
I would need to study your as-build data and for that I would need your vin number. But this is definitely a vehicle config problem and...