APR Intake Systems for the B9 A4, A5, S4, S5, RS4, and RS5 Platform
APR
02/10/2025
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APR is excited to introduce our Full Intake Systems for Audi B9 chassis vehicles, including the A4, A5, S4, S5, RS4, and RS5! Engineered for maximum airflow and improved turbocharger efficiency, these systems deliver measurable performance gains. Choose between a premium carbon fiber configuration for a high-end look and feel or a cost-effective PEX and composite setup—both designed to provide significant airflow improvements over the factory intake system.

B9 2.0T A4/A5 - Carbon Fiber
- Full intake system: Inlet, airbox, filter, and inlet piping
- Flows 46% more than stock
- Reduced pressure drop at the turbo inlet
- Enhanced engine sound
- Carbon fiber construction
- T304 stainless steel heatshield
- Turbo spool faster
- Turbo operates more efficiently
- Massive 7” x 7” filter with a 4” outlet and 5.5” frontal inlet
- High flow and washable pleated cotton gauze filter material
- Airbox has additional flow paths faced away from the engine
- Inlet piping diameter is maximized from the 4” filter all the way to the turbocharger
- Emissions friendly
B9 2.0T A4/A5 - PEX
- Full intake system: Inlet, airbox, filter, and inlet piping
- Flows 46% more than stock
- Reduced pressure drop at the turbo inlet
- Enhanced engine sound
- OEM appearing PEX construction
- T304 stainless steel heatshield
- Turbo spool faster
- Turbo operates more efficiently
- Massive 7” x 7” filter with a 4” outlet and 5.5” frontal inlet
- High flow and washable pleated cotton gauze filter material
- Airbox has additional flow paths faced away from the engine
- Inlet piping diameter is maximized from the 4” filter all the way to the turbocharger
- Incredible value
- Emissions friendly


B9 3.0T S4/S5 - Carbon Fiber
- Full intake system: Inlet, airbox, filter, and inlet piping
- +19 AWHP & +20 AWFT-LBS gain over stock (APR Stage 1 93)
- Flows 31% more than stock
- Reduced pressure drop at the turbo inlets
- Improved linearization across the turbos
- Enhanced engine sound
- Carbon fiber construction
- Turbos spool faster
- Turbos operate more efficiently
- Massive 7” x 7” filter with a 4” outlet and 5.5” frontal inlet
- High flow and washable pleated cotton gauze filter material
- Airbox has additional flow paths faced away from the engine
- Inlet piping diameter is maximized from the 4” filter all the way to the turbocharger
- Inlet piping addresses system restriction, unlike competitive airbox systems that are compatible with factory inlet piping
- Billet turbo adapter ring make fitting this system to a larger turbo possible
- New OEM gaskets included
- Emissions friendly
B9 3.0T S4/S5 - PEX/Composite
- Complete System Replacement: Includes inlet scoop, airbox, filter, and turbo inlet pipe, eliminating all factory restrictions.
- +19 AWHP & +20 AWFT-LBS Power Gains: Measured on our APR Stage 1 (93) SS.
- 31% More Airflow: Improved from 400 CFM (stock) to 525 CFM.
- Enhanced Turbocharger Efficiency: Reduces pressure drop, allowing the turbo to spool faster and operate more efficiently.
- High-Temperature Composite Turbo Inlet: Enables thin-wall tubing for maximum internal diameter and airflow.
- PEX Airbox: Heat-shield design with additional flow paths in low temperature zones.
- Massive Washable Filter: 7” x 7” pleated cotton gauze with a 5.5” frontal inlet and 4” outlet for superior filtration and performance.
- Future-Proof Design: Billet turbo inlet adapter accommodates larger turbos with a simple swap.
- All-Inclusive Kit: Includes OEM gaskets, clamps, and hardware for an easy, bolt-on installation.
- Emissions-Friendly: Requires no tuning and is compliant with emissions standards.
- Improved Engine Sound: Adds a sporty, refined tone without being overbearing.


B9 2.9T RS4/RS5 - Carbon Fiber
- Full intake system: Inlet, airbox, filter, and inlet piping
- +19 AWHP & +17 AWFT-LBS measured over stock (APR Stage 1 93)
- Flows 36% more than stock
- Reduced pressure drop at the turbo inlets
- Improved linearization across the turbos
- Enhanced engine sound
- Carbon fiber construction
- Turbos spool faster
- Turbos operate more efficiently
- Massive 7” x 7” filter with a 4” outlet and 5.5” frontal inlet
- High flow and washable pleated cotton gauze filter material
- Airbox has additional flow paths faced away from the engine
- Inlet piping diameter is maximized from the 4” filter all the way to the turbochargers
- Inlet piping addresses system restriction, unlike competitive airbox systems that are compatible with factory inlet piping
- Billet turbo adapter rings make fitting this system to larger turbos possible
- New OEM gaskets included
- Emissions friendly
B9 2.9T RS4/RS5 - PEX/Composite
- Complete System Replacement: Includes inlet scoop, airbox, filter, and turbo inlet pipe, eliminating all factory restrictions.
- +19 AWHP & +17 AWFT-LBS Power Gains: Measured on our APR Stage 1 (93) RS5.
- 36% More Airflow: Improved from 484 CFM (stock) to 658 CFM.
- Enhanced Turbocharger Efficiency: Reduces pressure drop, allowing the turbo to spool faster and operate more efficiently.
- High-Temperature Composite Turbo Inlet: Enables thin-wall tubing for maximum internal diameter and airflow.
- PEX Airbox: Heat-shield design with additional flow paths in low temperature zones.
- Massive Washable Filter: 7” x 7” pleated cotton gauze with a 5.5” frontal inlet and 4” outlet for superior filtration and performance.
- Future-Proof Design: Billet turbo inlet adapter accommodates larger turbos with a simple swap.
- All-Inclusive Kit: Includes OEM gaskets, clamps, and hardware for an easy, bolt-on installation.
- Emissions-Friendly: Requires no tuning and is compliant with emissions standards.
- Improved Engine Sound: Adds a sporty, refined tone without being overbearing.

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