APR PEX Intake System — Audi B9 S4 3.0T

Overview

Unlock the full airflow potential of your B9 Audi S4 or S5 with the APR Full Intake System for the EA839 3.0T engine. Unlike intake upgrades that only replace part of the factory system, APR's complete solution replaces everything from the inlet scoop to the turbocharger inlet, eliminating airflow restrictions throughout the entire intake tract. Designed to improve turbocharger efficiency, throttle response, and overall performance, the system delivers measurable power gains while maintaining OEM-quality fitment, emissions compliance, and everyday drivability.

Details

Performance Features

Maximum Airflow

The APR Full Intake System replaces the complete factory intake path with larger, less restrictive components, increasing airflow by 31% over stock (525 CFM vs. 400 CFM). The result is improved turbocharger efficiency, reduced pressure drop, and faster turbo spool.

Proven Power Gains

On an APR Stage 1 (93 Octane) equipped Audi S4, the Full Intake System produced gains of +19 AWHP and +20 AWFT-LBS without requiring additional tuning.

Optimized Intake Design

To maximize airflow in the limited engine bay space, APR utilizes high-temperature composite materials that allow thinner wall construction and a larger internal diameter than traditional aluminum tubing. The result is increased airflow while maintaining excellent heat resistance and durability.

OEM+ Engineering

Designed as a complete bolt-on replacement, the system includes a heat-shielded PEX airbox, oversized washable performance filter, billet turbo inlet adapter, and all necessary installation hardware for seamless OEM-quality fitment.

Construction & Design

Complete Intake Replacement

Unlike partial intake upgrades, APR replaces every major intake component, including:

• Inlet scoop
• Airbox
• High-flow air filter
• Turbo inlet pipe
• Billet turbo inlet adapter

This eliminates factory bottlenecks throughout the entire intake system.

High-Flow Air Filter

The oversized 7" × 7" pleated cotton gauze air filter provides exceptional airflow and filtration while remaining fully washable and reusable for long-term service life.

Future-Proof Design

The billet turbo inlet adapter is designed to accommodate larger turbocharger upgrades with a simple adapter change, making the intake compatible with future performance builds.

Key Features

• Complete intake system replacement from inlet scoop to turbocharger
• 31% greater airflow than the factory intake
• +19 AWHP and +20 AWFT-LBS gains on APR Stage 1 (93 Octane)
• Reduced pressure drop for improved turbo efficiency
• Faster turbo spool and improved throttle response
• Heat-resistant composite turbo inlet with maximum internal diameter
• Heat-shielded PEX airbox
• Oversized washable cotton gauze performance filter
• Billet turbo inlet adapter
• Includes all required clamps, gaskets, and installation hardware
• No ECU tuning required
• Emissions compliant
• Enhanced intake and turbo sound without excessive cabin noise

Compatibility Notes

• Fits B9 Audi S4
• Fits B9 Audi S5
• EA839 3.0T Turbocharged V6
• Compatible with factory and APR Stage 1 vehicles
• Designed to support future larger turbocharger upgrades

Important Notes

• Performance gains of +19 AWHP and +20 AWFT-LBS were measured on an APR Stage 1 (93 Octane) equipped vehicle.
• This intake is designed as a complete replacement for the factory intake system, providing maximum airflow without reducing components back to factory diameter.
• The washable cotton gauze air filter is reusable and should be cleaned and serviced periodically for optimal performance.
• No ECU tuning is required for installation, making the system an ideal upgrade for both stock and tuned vehicles.

Fitment