Installation REQUIRES cutting the Original Equipment (O.E.) system. BORLA system eliminates the O.E. resonators. This 2.25 in. diameter BORLA Cat-Back system is a True Dual design. The system fits both the '16-'17 Lexus IS200T and the '18-'24 IS300. It features single 4.25 in. x 3.5 in. oval polished T-304 stainless steel tips on each muffler assembly and the classic S-Type sound with no drone inside the vehicle. BORLA Cat-Back and Axle-Back exha ust 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 Sound of Power respected by motoring enthusiasts everywhere. Each system is built from pre mium T-304 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 numerical control (CNC) manufacturing ensures an accurate fit.