Hks Rear Section Exhaust System for Lexus IS 300 1998-20052 JZ-GE 3207-EX002 Carbon-Ti Series™ 304 SS Rear Section Exhaust System with Single Rear Exit by HKS®. Exhaust System Type: Rear Section. Exhaust Tubing Material: 304 SS. Main Tubing Diameter: 2.36". Exhaust System Sound: Aggressive / Loud. Professionally developed with a racer in mind, this HKS exhaust system provides an easy opportunity to upgrade both the horsepower and sound of your precious vehicle. Made from first class materials, it will serve you for years to come.