I know it isn't exactly the same, but I have the AWE track edition on my V8 S5 and drive 80 miles on the highway every day....and love it.
Drone is a factor of speed and gearing, so it is really hard to say, but I'm usually cruising at 80 mph and have no issues. I mostly notice drone in the 2,000 RPM range and at lower speeds like 35-40 mph (which I never hold for long anyway).
But when cruising...not an issue IMHO...
...and for that reason, get the track exhaust...you won't regret it...you want to hear that beutiful noise as much as possible.
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