You can tell by the fact that it’s a motorcycle. By design, motorcycles are loud, since being seen and, in this case, heard, is what allows a motorcyclist to navigate through traffic filled with SUVs with the windows, AC, and stereo all the way up, and still arrive in one piece. If you’re wanting to alter it, then the first thing you’ll want is some sort of muffler for the exhaust… but I’m not entirely sure they even make those. In a collision between motorcycle and car, car almost always wins, and so most motorcycles will be very loud, even at the cost of seeming like “that noisy jerk.”