Welcome to the team, as I am almost 99% certain you purchased a 2016 Cruze Limited (same style as 11-15 Cruzes) when you messaged Magnaflow and said 2016 Cruze, certainly they are thinking the new unreleased model when they say it'll only be a few months till they come out with one, as well don't have info for you. Because the 11-16 Limited models have plenty of exhaust choices.
TruBendz -
Catback Exhaust - Chevrolet - 11-15 Chevy Cruze - TruBendz Technology
is affordable and uses magnaflow mufflers.
Borla -
Cruze 2011-2015 Cat-Back Exhaust part # 140352
is top quality but a little more money.
ZZP -
ZZP Cruze Stainless Catback Exhaust - Exhaust
is good quality for a fair price.
Now, as for tunes! I have both BNR EFI Live and Trifecta. I am urging you to not get Trifecta. It did more harm then good for my vehicle, was more of pain in the ass than enjoyment. Results were not what was promised. BNR EFI Live tune is the way to go. Jerry is a whiz when it comes to tuning, he has the safest and most enjoyable tunes. Give him the business if you do decide to tune your car. A proper tune will be night and day difference in power and drivability.
If you have facebook CruzeTalk has a page, search them out, people are willing to help there asap.