This 2.5" diameter into dual 2" tail pipes Borla(r) Cat-Back(tm) system is tuned for performance and sound for the 2.4L engine in the BRZ and GR86. Our S-Type sound level is designed to bring out the Subaru engine rumble and provides a moderate sound without any drone. This system features single 5" round black chrome on T-304 stainless steel tips on each tail pipe. 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 is also available.For ease of installation, this Cat-Back(tm) is a direct bolt on part and does not require cutting. Borla(r) Cat-Back(tm) and Axle-Back exhaust systems feature patented straight-through and multi-core technology designed 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. Like all Borla(r) exhaust products, each system is handmade in the USA by master craftspeople and features premium, high-quality T-304 austenitic stainless steel construction. Ultra-smooth mandrel bends ensure maximum flow & power, and precision computer numerical control (CNC) manufacturing ensures an accurate fit. Best of all it features a Million-Mile Warranty.