Les,
the porting on a Taurus handgun does not, in my opinion, increase the noise for the shooter to any detectable level. If you shoot it on an indoor range, there is some difference, but most shooting is done outdoor with no 8 ft ceiling. Rifles with real muzzle brakes are another issue, not to be confused with a ported handgun. The porting directs the gas straight up, not back, as is the case with a muzzle brake designed to lessen recoil in a rifle. A MagnaPorted rifle is similar to a ported pistol, the idea is to reduce muzzle flip, not truly reduce recoil. While all gas the does not exit the muzzle at a direction that is in opposition to the shooter will reduce recoil to a cerain degree, there is no comparison between porting and muzzle brakes as far as the concussion and noise that the shooter experiences, or in true recoil reduction for that matter.