Not even a hint of drone. Doesn't sound as good as my 3" custom built exhaust with pacemakers and high flow cats but infinitely better on the highway which is awesome coz the old SS used to beat me to death with drone going to Sydney every other week.
Opens up by itself as soon as you hit 3k rpm (or switch to sports mode) and lets people know you mean business. It's also open when you start the car and quietens down after you move a bit.