Having looked at Donnington Track days before, I know that they do the 'Track Attack' and 'Noise Attack' days.
The dates you've got are for Track Attack days, which means having a standard 'road silenced' can... 98dba and under.
As present mine are open cans, but if it gets confirmed with others up for it, then I'll have to think about fitting my baffles in for the day
