Cold Air Intake For Hyundai Sonata (2011-2015) with 2.4L L4 Engine Red

Optimizing the Theta II: Performance Intake for the 2.4L Hyundai Sonata

Who It’s For: Engineered for 2011-2015 Hyundai Sonata owners running the 2.4L Theta II (G4KJ/G4KE) powerplant who are tired of the stock sluggishness and delayed throttle response inherent in the factory setup.

The Symptom: The factory intake on the Theta II engine is designed for absolute silence and mass-market comfort, not volumetric efficiency. It utilizes a series of restrictive resonator boxes and corrugated plastic accordion tubing that creates massive air turbulence and "dead zones" in the intake tract. For a vehicle of the Sonata’s weight, this results in a noticeable lag during mid-range passing maneuvers and a stifled feeling when the engine tries to climb the RPM ladder.

The Engineering Fix: This system replaces that restrictive plumbing with a mandrel-bent T304 aluminum tube, ensuring a constant diameter throughout the entire intake path. By eliminating the factory baffles and smoothing the internal surface, we promote laminar airflow, which reduces the parasitic drag on the engine’s intake stroke. Relocating the high-flow filter allows the engine to pull a higher density of oxygen, which the ECU utilizes to optimize the combustion cycle for better torque production and a much sharper throttle snap.

Why Mechanics Choose This Kit

• Enhanced Volumetric Efficiency: By reducing intake restriction, this kit allows the Theta II to achieve a better air-to-fuel mix, resulting in a documented increase of up to 10% in horsepower and torque depending on ambient conditions.
• Refined Induction Note: Replaces the generic vacuum-cleaner sound of the stock box with a purposeful, mechanical induction roar that becomes prominent only under heavy acceleration.
• Thermal Management: The T304 aluminum construction dissipates heat faster than heavy cast plastics, while the washable high-flow cotton media filter ensures the engine breathes clean air without the pressure drop found in paper filters.

Technical Specifications

Compatibility & OEM Reference

Fits the Following Vehicles:

• 2011 Hyundai Sonata (2.4L 4-Cylinder)
• 2012 Hyundai Sonata (2.4L 4-Cylinder)
• 2013 Hyundai Sonata (2.4L 4-Cylinder)
• 2014 Hyundai Sonata (2.4L 4-Cylinder)
• 2015 Hyundai Sonata (2.4L 4-Cylinder)

Interchange & Reference Data:

2011, 2012, 2013, 2014, 2015, 2.4L, L4, G4KJ, G4KE, T304-RD-SONATA

The Performance Promise

Buy with confidence. This system is a direct bolt-on upgrade that requires no permanent modification to your vehicle. It is designed to work within the parameters of your factory ECU, allowing for a seamless integration of performance and reliability. Backed by real automotive experts and fast shipping.