Corsa actually has been reported to drone. The only way to get rid of that drone is with a tuned J pipe, Helmholtz chamber. The only exhaust system that has this besides the stock exhaust system is Solo exhaust systems.
The least expensive exhaust mod is to remove the center muffler, the resonators at the rear bumper have a Helmholtz chamber so no drone but it will have a great muscle car sound. When floored it's damn near like straight pipes but driving nice and easy the sound is very close to how the old Fox body 5.0 Mustangs used to sound.
In 2014, I put the Mopar Catback - same as the Corsa Sport - on my '11 Challenger R/T and had no drone. I can't speak for the Corsa Extreme, but most systems that have resonators, don't have drone.