I've got a Hayame w/ a custom 2.25" mid-pipe. Revving the engine in neutral to about 3000 RPM's gets me to about 120 dbA at 20" from the tip (that's how cops are supposed to measure exhaust noise levels here in CA). I'll turn on my car and set off alarms close by. I can set off the warnings on alarms in mall-type parking lots with my foot OFF the gas (since it's a 4EAT).