I recently had my hearing checked and my Dr. suggested ear plugs regardless of pipes...He is also a long time rider and says he has gathered a lot of data than indicates wind noise and other sounds coming from the highway are far more damaging to ones ears than loud pipes, as a lot of the noise from pipes is behind the riders ears to a point....This is the second Dr. that has told me the same thing, that wind noise can cause far more damage to hearing than loud pipes, especially if you ride on the super-slab without a windshield, helmet or something to diminish wind noise.....No opinion, just repeating what I was told......My Dad never rode a motorcycle in his life, but his hearing went bad in his 70's from jet engines taking off and landing on the Naval base he worked on in California for over 20 years....Go figure....