Performance Air Intake for Scion xA/xB (2004-2006) with 1.5L L4 Engine Red

Optimizing the 1NZ-FE: Performance Induction for the Scion xA & xB

Who It’s For: Engineered for 2004-2006 Scion xA and xB owners running the 1NZ-FE powerplant who are tired of the stock sluggishness and restrictive factory airflow.

The Symptom: The factory intake on the 1NZ-FE is designed primarily for silence and cost-efficiency, not for performance. It utilizes a restrictive, multi-chambered resonator box and corrugated accordion-style plastic tubing. This design creates significant internal turbulence and "vortex shedding," which slows down air velocity and chokes the engine’s throttle response when you are trying to merge into highway traffic or pass another vehicle. In a lightweight but boxy chassis like the xB, every bit of lost air density translates directly to a sluggish, "wheezy" feeling under load.

The Engineering Fix: This system replaces that restrictive plastic plumbing with a 100% mandrel-bent T304 aluminum tube. Unlike factory molded hoses that collapse or ripple, mandrel bending ensures the pipe maintains a consistent internal diameter throughout the bend, promoting laminar flow. By smoothing out the airflow path and utilizing a high-flow cotton media filter, we significantly reduce the vacuum restriction seen at high RPMs. This results in a sharper throttle snap, better oxygen density for combustion, and a resonant induction note that lets the small-displacement 1NZ-FE breathe like it was meant to.

Why Mechanics Choose This Kit

• Consistent Power Gains: By optimizing the volumetric efficiency of the 1NZ-FE, you can expect an increase in horsepower and torque of up to 10%, giving the 1.5L engine much-needed mid-range punch.
• Enhanced Induction Note: Replacing the factory baffles and resonators allows the natural sound of the engine to come through, providing a deep, sporty growl under heavy acceleration without being obnoxious at cruising speeds.
• Professional Grade Hardware: Featuring T304 lightweight aluminum piping and a washable, reusable high-flow filter, this kit is built to last the life of the vehicle, with filter maintenance intervals only required every 50,000 miles.

Technical Specifications

Compatibility & OEM Reference

Fits the Following Vehicles:

• 2004 Scion xA 1.5L L4 Engine
• 2005 Scion xA 1.5L L4 Engine
• 2006 Scion xA 1.5L L4 Engine
• 2004 Scion xB 1.5L L4 Engine
• 2005 Scion xB 1.5L L4 Engine
• 2006 Scion xB 1.5L L4 Engine

Configuration Notes:

Fits Manual Transmission, Fits Automatic Transmission, 1.5L, 4-Cylinder, 2004, 2005, 2006

The Performance Promise

Installation is straightforward and typically completed in under 60 minutes with basic hand tools. We recommend disconnecting and resetting your battery terminal for 30 seconds after installation; this allows the ECU to recalibrate its fuel trim maps to account for the increased mass airflow. Buy with confidence. Backed by real automotive experts and fast shipping.