I'll second this. If we get close to trackside without ear plugs in it actually hurts your inner ear, I've never experienced anything like it.
I went to the Indy 500 this year, I heard in years past their noise rivals F1. But this year they downsized their engines, and the cars there were not impressive/loud. It would have been downright disappointing if I wouldn't have been so.."well hydrated" with beer. I really hope that doesn't happen to F1
Bernie (the godfather of F1) doesn't like the sound of the new engines, and may torpedo the planned change based on the sound issue alone.