High-Flow Intake Tube

The Stillen Z-Tube is a performance intake upgrade engineered to replace the restrictive factory intake tract in 2003-2007 Infiniti G35 coupes, 2003-2006 G35 sedans, and 2003-2008 Infiniti FX35 models. By utilizing a larger-diameter, roto-molded plastic design, this duct provides superior thermal insulation compared to the OEM equipment, allowing for a cooler, more efficient air charge entering the engine. It features an integrated Venturi ring that acts as a velocity stack to accelerate and direct airflow into the intake chambers. This is a direct bolt-on replacement part that is CARB Exempt (D-436-22) for street-legal performance. It can be installed with the stock airbox; however, for maximum performance gains, it is recommended to pair the unit with the Stillen Hi-Flow Intake filter (part# 402835), which includes a polyurethane heat shield. The system provides a more aggressive engine tone under acceleration while remaining quiet during cruising speeds.