Description

The HKS Air Intake Duct is a precision-engineered, single-component upgrade designed to unlock a critical bottleneck in the GR86/BRZ’s intake system. This direct replacement for the factory duct dramatically increases airflow capacity by enlarging the restrictive opening, channeling a greater volume of cool, ambient air into the engine bay. Utilizing a seamless blow-molded construction, it offers a measurable reduction in intake resistance for improved high-RPM breathing and power, all while maintaining the factory’s safe, street-friendly layout.

Product Highlights

📐 Massive Increase in Flow Area
The core of this upgrade is a simple yet radical dimensional change. HKS engineers enlarged the narrowest point of the duct from the stock ~50mm diameter to approximately 87.5mm. This represents a significant increase in cross-sectional area, directly targeting and eliminating a major factory restriction to maximize high-RPM airflow.

🧱 Seamless, High-Efficiency Construction
Crafted using a one-piece blow-molding process, the duct features a perfectly smooth interior with no internal seams or ridges. This optimized internal surface allows air to flow with minimal turbulence and drag, ensuring the gains from the larger diameter are fully realized from the front of the car to the airbox.

🛡️ Safe, OEM-Plus Design Philosophy
HKS maintains the factory duct’s routing and layout, including its protective design against water ingestion. This ensures the vehicle remains perfectly safe for street use in all weather conditions, providing a performance increase without compromising daily reliability or introducing risk.

📊 Proven Performance by Data
The effectiveness of this design is not theoretical. Internal HKS flow bench testing confirms a substantial reduction in intake resistance across the tested airflow range, providing quantifiable evidence of the duct’s contribution to improved engine breathing efficiency.

Technical Specifications

• Product Name: Air Intake Duct

• Model Code: 70999-AT003

• Compatibility: Toyota GR86 / Subaru BRZ (ZN8/ZD8, FA24, October 2021+).

• Material: High-density plastic (blow-molded).

• Key Specification: Minimum internal diameter ~87.5mm (vs. stock ~50mm).

• Key Benefit: Significant reduction in intake airflow resistance.

• Design: Direct OEM replacement layout; maintains factory rainwater protection.

• Installation Note: Requires front bumper removal. Estimated installation time: 2.0 hours.

■Intake duct flow bench comparison

Performance Philosophy

• Goal: To serve as a foundational, high-value modification that addresses a well-documented factory restriction. The focus is on pure, unimpeded airflow to support horsepower gains from other breathing mods (intake, exhaust, tune) and improve overall engine efficiency.

• Focus: A single-purpose, highly effective component that works in the background. It is an essential supporting mod for any build seeking maximum naturally aspirated power and is perfectly suited as a standalone upgrade for those beginning their performance journey or seeking optimized breathing for a stock or lightly modified engine.

Installation & Synergy Notes

• 🔧 Professional Installation Recommended
  Installation requires removal of the front bumper, with an estimated time of 2.0 hours. This is best performed by a professional technician to ensure proper fitment, alignment, and re-assembly of bumper components.

• ⚡ Synergistic Performance Partner
  The Air Intake Duct is designed to work in perfect harmony with other HKS intake components:

  • It is the ideal first step before upgrading the intake box or filter.

  • It is the included, optimized duct within the HKS Cold Air Intake Full Kit (70026-AT012).

  • When paired with the HKS Cold Air Intake Kit (70026-AT010) or the Carbon Suction Kit (70026-AT011), it creates a fully optimized intake path from the bumper to the throttle body.

Car model	Model	engine	model year	Code No.		operating instructions	remarks
								GR86	ZN8	FA24	21/10 –	70999-AT003			Estimated installation time: 2.0 hours. Front bumper removal required.