Universal Resonator Option 2.75in Center/Center 5in Round x 10in (BOR401338)Compact size is perfect for applications with limited space. Reversible design for installation flexibility. The 401338 resonator is ideal for taking a loud system down a notch. It can be used alone in a single exhaust system or in pairs in a dual system. 100% welded construction for strength. It features a straight through performance design and is constructed of T 304 stainless steel for high durability. It utilizes continuous filament fiber (CFF)