Why are 'loud' pipes automatically associated with wheeling & offside behaviour in reserves & sensitive places... 
Simple logic, really.
Why do people 'like' loud pipes?
Because it sounds 'lekker'. It also follows that people with loud pipes are prone to lots of throttle blipping - this is undisputed fact.
Blippers are also more, erm, prone to 'enjoying themselves'. This, by definition, means spinning, wheelying, revving, etc.
I have yet to see someone with an aftermarket pipe that doesn't give it extra horns. Otherwise, why bother spending so much money?