Invidia (HS13LISG3S) Q300 Cat-Back Exhaust System with Rolled Stainless Steel Tip for Lexus IS250/350 Fits 2013-Up Lexus IS250/350 Pipe size: 60mm (2.4"), Tip size: 110mm (4.3") Constructed with high-quality SUS304 stainless steel, CNC-machined flanges, Robot TIG welding and double wall tips Flat bottom shaped muffler design results in improved high speed aerodynamic performance, providing greater horsepower, torque gains and a rich, deep, sporty sound Rolled, Stainless Steel Tips