BORLA(r) presents their Axle - Back system for the fourth generation Mazda 3 Hatchback. The exhaust system replaces the stock rear muffler and is a direct bolt - on part for ease of installation. Specifically tuned for the 2.5L Skyactiv engine, our S - Type Axle - Back delivers a sportier sound and a more exciting driving experience without any drone. It features 4 Black Chrome on T - 304 stainless steel exhaust tips that properly fill out the rear bumper cutouts. Using BORLA(r) Stainless Steel Polish p 21461 is NOT recommended with these black chrome tips. We suggest cleaning the tips with hot water and a microfiber cloth. Bright Chrome tips are also available. Ultra - smooth mandrel bends ensure maximum flow power, and precision computer numerical control (CNC) manufacturing ensures an accurate fit. As you can expect from BORLA(r), the exhaust is constructed using T - 304 stainless steel and comes with a Million - Mile Warranty. Give your Mazda 3 the sound it deserves, bolt on a BORLA(r)., System Features, Axle - Back Exhaust System, S - Type Sound Level, T - 304 Stainless Steel Construction, 2.5 to dual 2 Pipe Diameter, 4 Black Chrome On T - 304 Stainless Steel Tips, No - Drone, Million Mile Warranty