This Resonator is designed to dampen the sound of the Borla(r) Bronco 2.3L High Clearance Climber / Rock Crawler systems. It is NOT designed to work with competitors or Original Equipment systems. 2.75" diameter inlet and turn down outlet. Built from premium high-quality T-304 austenitic stainless steel superior to T-400 series knockoffs (such as 409) to give you the absolute best in performance and durability. Ultra-smooth mandrel bends ensure maximum flow & power and precision computer numerical control (CNC) manufacturing ensures an accurate fit. Best of all Borla(r) stands behind every direct fit resonator with a Million-Mile Warranty. Just what you'd expect from the world's most experienced (and most winning) exhaust brand.