Yep done it by accident. Stereo was on loud and I overtook a truck without paying too much attention until the car felt like it had hit a brick wall. I think it was about 7500 (not sure I was trying to grab another gear at the time). No harm was done though. I would think that it is an ignition kill though, as a fuel cut could make the car run lean, but I'm only guessing.
I feel we have all done this ,I don't use the stereo any more,unless i'm in traffic.
The cars too quick some times to keep an eye on the rev counter.
6500-6700 is about the max now.keep radio off and practice listening to the pitch of the engine note.
Oh !! and get a nice dump valve and induction kit fitted ,you won't need a stereo.If you havn't got them already.