Stainless Steel Exhaust Headers for Nissan 350Z / 370Z & Infiniti G37 (2007–2014)

These stainless steel exhaust headers are designed to replace the factory exhaust manifolds on 2007–2008 Nissan 350Z, 2009–2014 Nissan 370Z, and 2008–2013 Infiniti G37 models equipped with V6 engines. The headers reduce exhaust restriction by using optimized primary runner design and larger diameter tubing compared to the factory manifolds. This results in improved exhaust scavenging, reduced backpressure, and measurable gains in horsepower and torque across the RPM range.

The system uses T-304 stainless steel construction with CNC-machined flanges and mandrel-bent tubing to maintain consistent flow characteristics. The headers are designed to work with factory exhaust systems or aftermarket cat-back exhaust components, providing improved exhaust flow while maintaining compatibility with existing exhaust configurations.

Vehicle Fitment

• 2007–2008 Nissan 350Z (3.5L V6 HR Engine)
• 2009–2014 Nissan 370Z (3.7L V6 Engine, All Models)
• 2008–2013 Infiniti G37 Coupe (3.7L V6 Engine)
• 2008–2013 Infiniti G37 Sedan (3.7L V6 Engine)

Performance & Design

The headers are engineered to improve exhaust flow efficiency through optimized primary runner length and diameter. Testing under controlled conditions has shown gains of up to 15 horsepower and 20 lb-ft of torque. Actual performance improvements will vary based on vehicle condition, elevation, ambient temperature, and existing modifications. The improved exhaust scavenging enhances throttle response and power delivery throughout the RPM range.

The primary runners measure 1 3/4 inches and 1 1/4 inches in diameter, with a 2 3/8 inch outlet diameter. This configuration reduces exhaust backpressure compared to factory manifolds while maintaining proper exhaust velocity for effective scavenging. The open header design produces a deeper, more audible exhaust note compared to the factory exhaust system.

Construction & Materials

The headers are constructed from T-304 stainless steel, which provides resistance to corrosion and heat in the exhaust environment. All tubing is mandrel-bent to maintain consistent internal diameter throughout each bend, reducing turbulence and maintaining exhaust gas velocity. Flanges are CNC-machined to ensure precise alignment with engine block mounting surfaces and provide proper sealing.

TIG and MIG welding is used at all joints to ensure structural integrity under high heat and vibration conditions. The stainless steel construction resists discoloration and corrosion over the life of the component, maintaining appearance and structural integrity in various operating environments.

Features & Components

• T-304 stainless steel construction
• CNC-machined flanges for precise fitment
• Mandrel-bent primary runners
• TIG and MIG welded joints
• 1 3/4" x 1 1/4" primary runner diameter
• 2 3/8" outlet diameter
• Reduces exhaust backpressure
• Improves exhaust scavenging efficiency
• Compatible with factory and aftermarket exhaust systems
• Produces deeper exhaust tone

What's Included

• Left-side exhaust header
• Right-side exhaust header
• Header gaskets
• OEM-style mounting bolts

Installation

• Direct replacement for factory exhaust manifolds
• Uses OEM bolt pattern and mounting points
• Compatible with factory or aftermarket exhaust systems
• Professional installation recommended
• Proper torque specifications must be followed
• New gaskets included for leak-free installation

Installation Note:
Installation requires removal of the factory exhaust manifolds and associated components. Professional installation is recommended to ensure proper torque specifications are followed and leak-free operation is achieved. New gaskets should be installed at all connection points.

System Compatibility

The headers are designed to work with factory catalytic converters and exhaust systems, as well as aftermarket cat-back exhaust components. The system can be paired with cold air intake systems and other performance modifications to optimize overall engine efficiency. The headers work with factory engine management systems and do not require tuning to function, though tuning may complement performance gains when combined with other modifications.

These stainless steel exhaust headers provide improved exhaust flow characteristics for 3.5L and 3.7L V6 engines while maintaining direct-fit installation with factory mounting points. The system is designed to reduce exhaust restriction and improve engine breathing efficiency.