I've several friends (yeah, yeah I know, friends don't let friends ride Jap bikes), that insist their bikes sound the same as my H-D, but it's wishful thinking.
There is a huge difference between "potato, potato, potato" and "putt-putt, ring-ding-ding, putt-putt".
The way they do it is to throw the in sync cylinders out of sync. The other is playing with the pipes but sound does not equal power.
When all is said and done, whether we ride harleys or they ride jap bikes, the most important thing is to ride and keep the rubber side down.