Lexus IS300 Performance Exhaust - ISR Performance - GT Cat Back - `99-`05. This ISR Performance GT cat-back system is built specifically for the 1999–2005 Lexus IS300 and delivers a single-exit profile that sharpens the car’s character without compromising everyday drivability.

Engineered as a direct-fit replacement for the stock exhaust, the GT cat-back focuses on producing a richer, more aggressive tone while keeping fitment straightforward for enthusiasts who prefer bolt-on upgrades. Its layout preserves factory hangers and routing so installation is quicker and cleaner than custom-fabricated systems. The result is an aftermarket exhaust that improves the driving experience for street and light spirited use while maintaining a usable sound level for daily driving.

Features

• Fitment: 1999–2005 Lexus IS300
• Type: GT Cat-Back, single exit design
• Direct-fit for bolt-on installation using factory mounting points
• Tuned for a deeper, more aggressive exhaust note while remaining street friendly

If you have questions or want help confirming fitment, call us directly — we’re happy to assist. We have two installation and customization locations: Austin, Texas and the Los Angeles, California area. Call our Austin shop at 512-982-9393 (TX) or our California shop at 562-981-6800 (CA) to schedule service or discuss options. If you’re considering purchasing multiple items, contact us for shipping discounts. We install on premises at both locations.

CA Residents: WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov