on a 1-10 scale of loudness, and 10 being a short pipe and 1 being stock, it's going to be around a 8/10 for loudness. Here's the great thing, if you buy the akro silencer, it'll drop it down to about a 5/10.
The good thing about this exhaust, it's a low note, meaning that even at a louder sound, because it's not pitchy, it doesn't hurt your ears or others around. But don't kid yourself, anything with the cat removed is going to be loud. In the city, I ride a gear up and keep revs low to avoid a ticket. On the hwy, no difference but my buddies say when I pass them they feel the "rumble" of my bike. Akro muffler and midpipe setup.