Steel Pack 20 x 26 Porter Muffler with 1 3/4" Inlet/Outlet. High quality steel packed mufflers (painted or stainless steel)...."Where the sound meets the asphalt". Classic PORTER MUFFLERS™ come in standard high temp Porter ceramic blue, or can be ordered in stainless steel. Manufactured from 14 gauge tubing with 12 gauge end caps. Packed with stainless steel. Custom sizes can be ordered