This BORLA® 2.5" diameter True Dual Axle-Back system was designed specifically for the Lexus RCF ('15-'25) and IS 500 ('22-'25). It delivers the classic S-Type sound with no drone inside the vehicle, and features dual 4" round bright chrome on T-304 stainless steel tips on each muffler assembly. A system with black chrome on T-304 stainless steel tips is also available. Add optional mid section 60738 to this Axle-Back system to create a Cat-Back™ system. Part number 60738 is designed to work ONLY with BORLA® Axle-Back systems 11981 & 11981BC. Installation of 60738 REQUIRES cutting the mid section of the stock exhaust and welding inlet pipes to rear of the catalytic converters. The BORLA® mid section features a merge X-Pipe and will increase the overall sound volume while maintaining the tone of 11981 & 11981BC. All BORLA® Cat-Back™ 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® Sound of Power respected by motoring enthusiasts everywhere. Each system is built from premium 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. Best of all, BORLA® stands behind every system with a Million-Mile Warranty. Just what you'd expect from the world's most experienced (and most winning) exhaust brand.