My '02 L is totally bone stock, 1,100 miles on it. You can hear the blower at any RPM as long as it's boosting.
I can run 80 mph with no whine, or I can run 1 mph and whine loud enough to hear it better than the exhaust. It's all a matter of throttle position and boost.
WOT from a dead stop is all blower whine, loud enough in my '02 that I can't hear the engine over it.