Would someone explain how a very load noise behind you, will allert someone ahead of you? I do not get it?
This topic has been misunderstood. The OP mentioned loud pipes when
LANE SPLITTING in California.
Have you ever done that? I have. Yes, they are going slow enough that loud pipes can be heard ahead of them.
Must be a CA physics thing. If a sound is behind you how would someone in front of you hear it. If you are at someones rear bumper with your front wheel in the "third" lane, how the hell can he hear your bike? Oh well I am dense and no I do not lane split here in PA. And if I could do it here I am not sure I would because of the inherant risk of placing my life in the hands of those drivers on either side of me. I was taught to control my lane and bike, how do I know what hundreds of drivers are going to do as I move through the "third" lane?
Definitely don't want to beat this dead horse...
But because you may not realize, not having done this. Most (all?) of the splitting riders do in Cali is simply filtering up to the front of traffic at a light. So the cars are stopped and the bikes are getting to the front.
Because sound isn't directional, stopped cars can hear the bikers coming and (hopefully) get out of the way (make room for the bike).
Of course at speed, the sound emanating forward is lessened. That's where the "all the sound is behind you" comes from.
Again, the filtering and splitting I did, was okay with my stock pipes. But I can also understand someone wanting louder pipes in some of those situations.
Now back to your regularly scheduled dog pile