Static isn't a problem at Bedford, it's the drive-by that gets everyone. And of course, you can't tell that until you get there and get black-flagged, by which time it's usually too late to do anything and your day is ruined.
As a trackday-using community, we should all be trying to make an effort to reduce the volume of our cars whenever we go on track so as not to give the NIMBYs any ammo. It's easy to pop a stock backbox back on, or refit the cats if you've got decats on there, before the day itself and that way you make life a lot easier for yourself as well as protecting the future of trackdays. Besides, once you've got your helmet on everything is muffled anyway, so the only person your car sounds nice to is the marshall waving that black flag at you!