Get maximum flexibility from your modular SLP cat-back with this "Shotgun" race resonator. Standard equipment on our F-Body Loud Mouth systems, it allows you to switch between muffled and "wide open" exhaust configurations in a matter of minutes. Each resonator is constructed from hand-polished 304 stainless steel and embossed with the classic SLP logo. NOTE: May also be used in the fabrication of custom exhaust systems (see measurements below). Does not fit 2.5" Mustang or GTO systems. Measurements: 3" ID/OD 4" body diameter 18-1/4" overall length