Borla CrateMuffler Big Block Chrysler Dodge Plymouth (Mopar Borla CrateMuffler for Small Block Chevrolet High Output 350 383 406 Borla CrateMuffler for Chevrolet Small Block High Output 350 383 406 Borla CrateMuffler Hot 3.0 inch Offset Center 14in x 4.35in x 9in. This muffler is directional. The outlet can be identified by the mounting bracket welded to the endcap. The world's first mufflers purpose built to optimize the sound & power of crate and custom built motors. Built from premium T 304 stainless steel, superior to T 400 series knockoffs (such as 409), to give you the absolute best in performance and durability. Best of all, Borla stands behind every system with a Million Mile Warranty. Just what you? d expect from the world? s most experienced (and most winning) exhaust brand.