I've got a gen 2 with arrow end cans and a hooked air box, at Snett a couple of weeks ago it was 103.8db, limit there is 102 so had to put db killers in then it was 98db, but it do vary depending on whose doing it on any given day for some reason, and different tracks have different limit's, cadwell for instance is 105db at 5000 revs.