I don't know much about the Akra system for the XR, but I'm assuming it comes with the noise insert like mine did. If so, I would not worry about noise at all. It is very tolerable with the insert in. Even with it out it's not bad. It is loud, but because it is a mellow sound, it isn't bad.
I used to live in California (Hermosa Beach) and I would have ridden my bike with the Akra and no insert out there. You can always give it a shot unitl you get pulled over, then just start using the insert.