The Aero resonators are proven to reduce rasp and drone while withstanding up to 1800 degrees Fahrenheit. Aero resonators are manufactured out of the highest quality T-304 stainless steel with a ceramic packing . Dimensions: 14" Overall Length x 10" Body - 2.5" Inside Diameter Inlet and Outlet x 4" Round Body Polished "AERO Exhaust" Stamped on this resonator.