Performance Air Intake for Scion xA xB (2004-2006) 1.5L Engine

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 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 lightweight aluminum piping and a washable, reusable high-flow filter, this kit is built to last the life of the vehicle.

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.

Common Questions

Will this intake fit both the Scion xA and Scion xB from 2004 to 2006?
Yes. It is engineered specifically for the 2004, 2005, and 2006 Scion xA and Scion xB equipped with the 1.5L 1NZ-FE 4-cylinder engine.

Does this work with both automatic and manual transmissions?
Yes. This intake system fits both manual and automatic transmission models without modification.

Will this fit later-generation Scion xB models?
This kit is built specifically for the first-generation 2004–2006 Scion xA and xB with the 1.5L 1NZ-FE engine. Later-generation xB models use a different engine platform.

Is the air filter washable and reusable?
Yes. The kit includes a high-flow cotton media filter that can be washed and reused rather than replaced with disposable paper filters.

How long does installation take and do I need special tools?
Installation typically takes under 60 minutes using basic hand tools. Disconnecting the battery terminal for 30 seconds after install is recommended so the ECU can recalibrate for the increased airflow.