ISR Performance Catback Exhaust — Fits 1999-2005 Lexus IS300 (1st Gen)

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SKU: ISRIS-GT-IS300-1G
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Car Wheel Size Chart

Wheel Diameter (inches) Tire Width (mm) Aspect Ratio Rim Width (inches)
14185655.5
15195606.0
16205556.5
17215507.0
18225457.5
19235408.0
20245358.5

Note: Wheel and tire sizes vary by car make and model. Always consult your vehicle’s manufacturer for exact specifications.

How to Read Tire Size

Example: 225/45R17 means:

  • 225 = Tire width in mm
  • 45 = Aspect ratio (height as % of width)
  • R17 = Rim diameter in inches

Product Details

Product Description
Part Numbers
Sizing & Fit

About ISR Performance

ISR Performance engineers high-quality automotive parts and accessories trusted by enthusiasts and shops across North America. At GGCRACING we stock the full ISR Performance lineup with fast shipping and expert fitment support — order with confidence.

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ISR Performance GT Single Catback Exhaust for 1999-2005 Lexus IS300

Transform the sound and performance of your 1st Gen Lexus IS300 (1999-2005) with the ISR Performance GT Single Catback Exhaust system. This exhaust is meticulously engineered to provide a deep, aggressive tone while improving exhaust flow for noticeable performance gains.

Key Features of the ISR GT Single Catback:

  • Vehicle Specific Design: Tailored for the 1999, 2000, 2001, 2002, 2003, 2004, and 2005 Lexus IS300, ensuring a perfect fit.
  • Aggressive Sound: Delivers a sporty and resonant exhaust note that enhances the driving experience without being overly intrusive.
  • Performance Enhancement: The free-flowing design reduces backpressure, allowing your engine to breathe easier for improved horsepower and torque.
  • Durable Construction: Built with high-quality stainless steel or mild steel (depending on variant) for excellent corrosion resistance and longevity.
  • Easy Installation: Designed as a direct bolt-on replacement for the factory catback system, simplifying the installation process.

The ISR Performance GT Single Catback Exhaust is the ideal choice for IS300 owners looking to upgrade their exhaust system for better sound, improved performance, and a more engaging driving experience. Its robust construction ensures it can handle the demands of daily driving and spirited performance.

Get your ISR Performance exhaust system today at GGCRACING.

Product Details

Product Description
Part Numbers
Sizing & Fit

About ISR Performance

ISR Performance engineers high-quality automotive parts and accessories trusted by enthusiasts and shops across North America. At GGCRACING we stock the full ISR Performance lineup with fast shipping and expert fitment support — order with confidence.

Watch in action

ISR Performance GT Single Catback Exhaust for 1999-2005 Lexus IS300

Transform the sound and performance of your 1st Gen Lexus IS300 (1999-2005) with the ISR Performance GT Single Catback Exhaust system. This exhaust is meticulously engineered to provide a deep, aggressive tone while improving exhaust flow for noticeable performance gains.

Key Features of the ISR GT Single Catback:

  • Vehicle Specific Design: Tailored for the 1999, 2000, 2001, 2002, 2003, 2004, and 2005 Lexus IS300, ensuring a perfect fit.
  • Aggressive Sound: Delivers a sporty and resonant exhaust note that enhances the driving experience without being overly intrusive.
  • Performance Enhancement: The free-flowing design reduces backpressure, allowing your engine to breathe easier for improved horsepower and torque.
  • Durable Construction: Built with high-quality stainless steel or mild steel (depending on variant) for excellent corrosion resistance and longevity.
  • Easy Installation: Designed as a direct bolt-on replacement for the factory catback system, simplifying the installation process.

The ISR Performance GT Single Catback Exhaust is the ideal choice for IS300 owners looking to upgrade their exhaust system for better sound, improved performance, and a more engaging driving experience. Its robust construction ensures it can handle the demands of daily driving and spirited performance.

Get your ISR Performance exhaust system today at GGCRACING.

Product Details

Product Description

About ISR Performance

ISR Performance engineers high-quality automotive parts and accessories trusted by enthusiasts and shops across North America. At GGCRACING we stock the full ISR Performance lineup with fast shipping and expert fitment support — order with confidence.

Watch in action

ISR Performance GT Single Catback Exhaust for 1999-2005 Lexus IS300

Transform the sound and performance of your 1st Gen Lexus IS300 (1999-2005) with the ISR Performance GT Single Catback Exhaust system. This exhaust is meticulously engineered to provide a deep, aggressive tone while improving exhaust flow for noticeable performance gains.

Key Features of the ISR GT Single Catback:

  • Vehicle Specific Design: Tailored for the 1999, 2000, 2001, 2002, 2003, 2004, and 2005 Lexus IS300, ensuring a perfect fit.
  • Aggressive Sound: Delivers a sporty and resonant exhaust note that enhances the driving experience without being overly intrusive.
  • Performance Enhancement: The free-flowing design reduces backpressure, allowing your engine to breathe easier for improved horsepower and torque.
  • Durable Construction: Built with high-quality stainless steel or mild steel (depending on variant) for excellent corrosion resistance and longevity.
  • Easy Installation: Designed as a direct bolt-on replacement for the factory catback system, simplifying the installation process.

The ISR Performance GT Single Catback Exhaust is the ideal choice for IS300 owners looking to upgrade their exhaust system for better sound, improved performance, and a more engaging driving experience. Its robust construction ensures it can handle the demands of daily driving and spirited performance.

Get your ISR Performance exhaust system today at GGCRACING.

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