Resonators, Pontiac GTO "Loud-Mouth" Shotgun, shipping is not included. Get maximum flexibility from your modular SLP cat-back with these "Shotgun" race resonators. Standard equipment on many of our Loud Mouth systems, they make it possible to switch between muffled and "wide open" exhaust configurations in a matter of minutes. All resonators are constructed from hand-polished 304 stainless steel and embossed with the classic SLP logo. NOTE: Sold in pairs. May also be used in the fabrication of custom exhaust systems (4" body, 2.5" inlet, 2.5" outlet). Does not fit 3" F-Body system. Measurements: * 2.5" ID/OD * 4" body diameter * 18-3/16" overall length