2001-2005 Lexus IS300 3.0L Exhaust Header Manifold Stainless Steel

CNRautoparts 2001-2005 Lexus IS300 3.0L Stainless Steel Exhaust Header Manifold
Revitalize your Lexus IS300’s engine performance with a precision-engineered upgrade designed for enthusiasts who demand power, durability, and seamless fitment. Crafted from high-quality T304 stainless steel, this exhaust header manifold replaces the restrictive factory manifold, optimizing exhaust flow to unleash your 3.0L inline-six engine’s true potential. Whether you’re tackling daily drives or pushing limits on the track, this aftermarket header delivers unmatched reliability and performance gains—all while maintaining a direct bolt-on installation.

Don’t settle for mediocre engine output. The 2001-2005 Lexus IS300 3.0L Stainless Steel Exhaust Header Manifold combines race-inspired engineering with everyday reliability, offering a cost-effective way to elevate your IS300’s performance. 

Key Features & Benefits

1. Premium T304 Stainless Steel Construction
Built to last, the manifold is constructed from corrosion-resistant T304 stainless steel, ensuring superior durability under extreme temperatures and harsh conditions. Unlike cheaper alternatives, this material resists rust and oxidation, preserving structural integrity and aesthetics for years.

2. Performance-Driven Design
Engineered with equal-length tubular headers and mandrel-bent tubing, this manifold minimizes exhaust backpressure and turbulence. The result? Smoother exhaust gas evacuation, faster spooling, and a noticeable boost in horsepower and torque across the RPM range. Drivers will experience sharper throttle response, enhanced acceleration, and a deeper, aggressive exhaust note.

3. Direct Bolt-On Replacement
Designed as a direct fit for 2001-2005 Lexus IS300 models with the 3.0L 2JZ-GE engine, this header eliminates the need for cutting or welding. CNC-machined flanges and OEM-style mounting points guarantee perfect alignment with your existing exhaust system and emissions components, making installation straightforward for DIY mechanics or professionals.

4. TIG Welded for Precision
Every joint is reinforced with industry-standard TIG welding, ensuring leak-free performance and maximum strength under high-pressure conditions. The smooth internal surfaces of the tubing further reduce turbulence, promoting consistent exhaust flow.

5. Emissions Compliance Ready
Maintain street legality with confidence. This header integrates seamlessly with factory oxygen sensors and catalytic converters, ensuring compliance with emissions regulations in all 50 states.

Technical Specifications

• Fitment: 2001-2005 Lexus IS300 3.0L (2JZ-GE Engine)
• Material: T304 Stainless Steel
• Finish: Coated
• Header Inlet / Outlet Size (IN): 1.5" / 2.125"
• Mounting Style: 3 Bolt
• O2 Sensor Bung Included: Yes
• Expect Gains of 10 up to 15 HP/TQe

Why Choose This Exhaust Header Manifold?
The factory exhaust manifold on the Lexus IS300 is a known bottleneck, stifling performance with its cast iron design and uneven runner lengths. By upgrading to this stainless steel header, you eliminate these restrictions, unlocking quicker engine breathing and measurable power gains. Enthusiasts report improved drivability, reduced engine heat soak, and a more responsive driving experience—whether carving corners or merging onto highways.

For tuners and daily drivers alike, this manifold serves as a foundational mod for future upgrades. Pair it with a high-flow catalytic converter or cat-back exhaust system to maximize gains.