I have been riding in N.C. for several years . My pipes are loud as heck but I have never been pulled over and it passes inspection. My carbs are re-jetted and she burns just a bit rich. Other than them turning blue near the heads which I constantly polish. No problem she rumbles almost to the point of back firing and never had a problem with the law. My take is a bike is much safer if it is loud. They are aware you are there when they can hear you. Whatever you do make sure it is safe. Good luck.