STILLEN 2003-2007 Infiniti G35 Air Intake (Hi Flow w/ Z-Tube) - 402834

The STILLEN Hi-Flow Air Intake with Z-Tube is engineered to improve airflow, throttle response, and horsepower for Infiniti G35 models equipped with the VQ35 engine. Designed and manufactured in the U.S.A., this system replaces the restrictive factory intake tract with a smoother, higher-flow design that delivers measurable performance gains while maintaining factory drivability and emissions compliance.

Vehicle Fitment:

• 2003–2007 Infiniti G35 Coupe
• 2003–2006 Infiniti G35 Sedan

Key Features & Benefits:

• Gains up to 11 wheel horsepower on Sedan models
• Gains up to 5 wheel horsepower on Coupe models
• Improves throttle response across the entire rev range
• Enhances acceleration and overall engine efficiency
• Increases airflow and filtration efficiency
• Helps improve fuel mileage under normal driving conditions
• Runs perfectly on the stock ECU calibration
• No check engine light and no tuning required
• Simple driveway installation with basic tools
• Improves engine bay appearance
• CARB Exempt – EO D-436-12
• Limited Lifetime Warranty

Z-Tube Design Advantages:

• Roto-molded plastic construction for excellent heat insulation
• Eliminates factory intake baffling for increased airflow efficiency
• Direct replacement for the OEM intake tube
• Includes connections for all factory breather tubes
• Eliminates weak factory intake couplers

Intake System Components:

• STILLEN Hi-Flow intake tube with smooth internal surface
• STILLEN washable and reusable oiled air filter
• Aluminum Venturi Ring for improved airflow velocity
• Polyurethane heat shield for true cold air isolation

Performance Overview:

The factory Infiniti G35 intake system prioritizes noise reduction over airflow efficiency. By comparison, the Nissan 350Z uses a more efficient intake design despite sharing the same VQ35 engine. STILLEN’s Hi-Flow Intake with Z-Tube bridges that gap by improving airflow consistency and reducing intake air temperature.

The roto-molded Z-Tube resists engine bay heat, helping maintain a cooler intake charge. The included Venturi Ring functions as a velocity stack, accelerating airflow into the intake tract and improving volumetric efficiency. The result is stronger mid-range response, increased top-end power, and smoother throttle modulation.

Independent testing has shown gains of 11 horsepower at 6,100 RPM on the G35 Sedan and 5 horsepower at 5,700 RPM on the G35 Coupe, depending on factory tuning variations.

Sound Characteristics:

Under throttle, the intake delivers a more aggressive induction tone without excessive cabin noise. At idle and cruising speeds, sound levels remain refined and unobtrusive.

The STILLEN Hi-Flow Air Intake with Z-Tube [402834] is a proven, emissions-legal upgrade that delivers real performance gains without compromising reliability, drivability, or warranty peace of mind.