Stablecoin Lending: The Ultimate Guide Ledn Blog Borla S Type 2.25" Cat Back Exhaust. System features a mirror polished T 304 stainless steel tip for sharp appearance. BORLA Cat Back & Axle Back exhaust systems feature patented straight through and multi core technology to unleash hidden horsepower. Increased exhaust velocity adds power, driving excitement, fuel economy, and the distinctive BORLA Sound of Power respected by motoring enthusiasts everywhere. Each system is built from premium 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 controlled CNC manufacturing ensures an accurate fit. Best of all, BORLA stands behind every system with a Million Mile Warranty. Just what youd expect from the worlds most experienced (and most winning) exhaust brand.