I initially had the Magnaflow xtremes on my 17 GT (w/kooks LT green cats). Great, deep rumble but the in-car drone was far too much to enjoy. Switched to Corsa Sports and am completely happy with loss of drone
I bought a 17 base GT 6 speed back in June for $30,800 out the door. Reasons (in order):
1. Didn't wanna pay the premium for the 2018
2. didn't wanna wait for the 2018
3. wasn't a huge fan of the new front end
4. all the cool stuff for the 2018 that enticed me were optional and not standard...