I think this is a long running debate, as Slappy has mentioned. I too had loud bikes in the past and still have one, although not ridiculously but still loud, the laws are currently in place, they just need enforcing.
I think it's also worth mentioning many cars now have loud exhausts, I've got one further around my close. He's not young about 70, with an 90's Supra, done up like Fast and Furious, it's loud, way louder than my ZX10R with it'a race Akrapovic with the baffle removed. He often of late, he starts it up revving it on his drive way for half an hour, it's caused many an argument with his neighbours!
I can often hear cars hammering out of my village, bikes too but a lot of cars!
Enforcement of current laws is what is needed in my opinion.