System Features: T-304 Stainless Steel Construction System Diameter: Single 2.25" to Dual 2.25" S-Type Sound Level No Drone Bolt-On Installation Tips NOT Included Reuse O.E. Tips Each BORLA® Exhaust System is built from premium T-304 austenitic stainless steel 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.