Probably need a suppressor - Ammo, Inc. StelTH 9mm Luger 165 grain Total Metal Jacket Brass Cased Centerfire Pistol Ammunition

Took it to the range, open air, and any noise reduction was absolutely minimal. Sounded almost at the same decimal level as any other ammo and can only conclude that is must be designed to work with a suppressor, which of course, would seem to be redundant and unnecessary.