The BORLA R&D Team has developed an awesome sounding exhaust for your Kia K4. Our 2.25" diameter Axle-Backâ„¢ system is specifically tuned for the 2.0L engine. The S-Type system delivers a sound that is much sportier than stock yet still refined and far from obnoxious. Not to mention a drone-free driving experience for comfort during cruising speeds. The exhaust exits thru a 2.25" brushed T-304 stainless steel turn down spout with a laser cut BORLA logo. BORLA Cat-Backâ„¢ & 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 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 a flow & power and precision computer numerical control (CNC) manufacturing ensures an accurate fit. Bolt-on a BORLA and get the sound to match your Kia's Performance. 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 youâ€d expect from the worldâ€s most experienced (and most winning) exhaust brand.