I would have to double check what Toyota/BMW recommend, but more and more manufacturers are starting to specify an recalibration/programming of the Forward Collision Monitoring/Adaptive Cruise Control/etc. systems when an alignment is preformed. I think as of around 2015 or so Chrysler say...
I had an ARK full catback system when I had a V6 Genesis Coupe and it was amazing, no droning, moderate around town and amazing when you got on it. Also when you hit a downshift right it had some amazing pops off throttle. If I ever pick one to put on my supra it would probably be theirs.