Borla(r) presents our Axle-Back system for the fourth generation Mazda 3 Sedan. The 2.25" diameter into dual 2" system replaces the stock rear muffler and is a direct bolt-on part for ease of installation. Specifically tuned for the 2.5L Skyactiv engines, our S-Type Axle-Back delivers a sportier sound and a more exciting driving experience without any drone. It features 4" round black chrome on T-304 stainless steel exhaust tips that properly fill out the rear bumper cutouts. Using Borla(r) Stainless Steel Polish p# 21499 is NOT recommended with these black chrome tips. We suggest cleaning the tips with hot water and a microfiber cloth. A system with bright chrome on T-304 stainless steel tips are also available. Borla(r) Cat-Back(tm) & 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(r) Sound of Power respected by motoring enthusiasts everywhere. 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) .