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 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