Borla crate muffler.

BORLA®'s CrateMuffler® is the world's first muffler purpose-built to optimize the sound & power of crate and custom built motors. The mufflers are directional. The outlet can be identified by the mounting bracket welded to the endcap. The directional design provides the classic S-Type sound and will dramatically reduce, or eliminate drone on specified applications. Add resonator 400938 to attain the Touring sound. Just what you'd expect from the world's most experienced (and most winning) exhaust brand.