Stainless Headers Mfg.&nbsp; 2.5&rdquo; X 4" Stainless Extended Exit Bullet Race Muffler - American Made Manufactured By Stainless Headers Mfg., Inc. in their U.S. Facility from 304 stainless steel Features a straight through design with a unique 4 extended muffler secondary Hand Made and Purge Tig Welded - They are ideal for side exit header designs Fabricated with a perforated core and packed with a tough stainless steel scrubble Inlet/Outlet Diameter: 2 1/2" OD  Muffler Body 3 OD X 4 Long  9 Overall Length