1984-1992 Camaro / Trans Am 5.0L/5.7L V8 3in Adj SS Cat-Back Exhaust w/ Adapters (BOR14888)This system includes the adapters needed to match the different pipe diameters coming out of the catalytic converters. Some pipe from the outlet end of the catalytic converter will be needed to mate up with the adapter. This Cat Back system is unique in the industry with an adjustable sound level. By changing the block off plates behind the center tip you can adjust the SPL (Sound Pressure Level) to your taste. System features dual 2. 5" round