SLP Performance a trusted industry leader Backed by manufacturer's Warranty Great Performance Enhance your vehicle Fast Shipping SLP's Loud Mouth "Shotgun" Resonators offer wide open exhaust flow and race-ready performance with an ultra aggressive sound too match. Standard equipment on our Loud Mouth exhaust systems, each resonator boasts its own unique tone and flow characteristics. They are constructed from hand-polished stainless steel and embossed with the classic SLP logo.