Emergency vehicles project sound forwards and to the sides with sirens and speakers. The majority of loud motorcycle exhaust noise is projected to the rear.
Both soundmakers have the same problem - modern cars are too insulated. When my friend got a then-new Hyundai Genesis sedan in 2015, we took it to Rick Fairless’ famous Harley rider bar, Strokers. We found the loudest Harley in attendance - straight pipes with megaphone resonator tips to make it even louder. We had the rider rev it up and we could *not* hear the bike inside the car from 30 feet away. We also could not hear most emergency sirens. Most modern cars are like this and it has been an increasing concern for emergency vehicles. All your loud pipes are doing is annoying non-motorists and attracting cops at this point.
I'll just tell you flat out, you will never convince me I'm wrong. Loud pipes save lives, period. I have personally seen it happen - or more importantly incidents not happen. Sure there are lots of reasons they are not 100% effective, but you know what, they are far more effective than quiet pipes. If it annoys people, tough, in fact good. It means we (riders) are on their mind more. Attract the cops? Bring it.