APR Carbon Fiber Intake - C8 4.0T CI100050

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Specifications:

BrandAPR
Part NumberCI100050
GTIN00810009933854
Filter ColorRed
Emission Code7
Engine Application4.0t
Filter MaterialPleated Cotton Gauze
Material6061 Aluminum, Carbon Fiber
Product TypeIntake Systems

Specifications:

Description:

The APR 4.0T EA825 Intake System is here for the Audi (C8) RS6 and RS7!The APR Intake System is a substantial upgrade for the 4.0T EA825 engine. It offers significant horsepower and torque gains through a high flow design that greatly increases airflow while reducing pressure drop.We've upgraded every part that actually translates to increased performance. Throttle response sharpens, as the system lets your engine to breath more freely. This causes the turbochargers to work less hard, which directly translates to the gains you feel. On top of that, the stunning carbon fiber and aluminum design looks fantastic in the engine bay and adds a pleasant auditory note to the engine. The filter is washable and reusable, and the cast aluminum turbo inlets use adapter rings with ideal entrances, making them compatible with larger turbochargers. This lets the system support even higher airflow levels, with low pressure drop, and even more horsepower and torque as you continue to mod!Design Overview and Testing:There was no component overlooked in the search for performance; the airbox, filter, couplers, and turbo inlets were each extensively analyzed and modified for maximum flow. The upgraded APR filter unit, featuring a low restriction cotton gauze media, flows 8% more than stock without sacrificing air quality. Flow is further improved by 52% larger airbox outlets, and 93% larger turbo inlets. The significantly improved APR turbo inlets are compatible with turbos featuring up to a 29% larger inlet port; various inlet adapters ensure that the APR intake will provide optimized flow for a wide range of turbos. Overall flow improvements of the intake result in a 50% reduction in pressure drop compared to OEM. The APR intake flows 19% less than the theoretical maximum supported by the OEM turbo inlet port diameter; a significant improvement compared to the OEM intake which flows 37% less than the theoretical maximum.Such significant improvements in flow quality and quantity are manifested in faster throttle response, reduced strain on the turbo, and increased efficiency which translates to more power. On the Stage 1 (93) APR RS6, an additional 47 AWHP and 38 AWFT-LBS of torque, to all four wheels, was measured on our calibrated chassis dynos. Whether you are looking to improve the performance of your stock RS6, or pushing the limits with larger turbos, the APR intake will support your efforts.

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Buyer's Guide

Air Intake Buyer's Guide

An aftermarket air intake helps your engine breathe better so you can make more power. Stock intake systems are designed to balance noise, cost, and filtration rather than maximize airflow. An aftermarket intake prioritizes flow, allowing more air to reach the engine and supporting higher horsepower. This guide covers how air intakes work, what performance gains to expect, and what to verify before purchasing.

Why Upgrade Your Air Intake

Reduced Airflow Restriction: An aftermarket intake with a larger, less restrictive filter increases the volume of air your engine can draw in, directly supporting more power.
Cooler Intake Temperatures: Positioning your air filter away from hot components in your engine bay allows the engine to draw in denser, cooler air, increasing maximum power.
Improved Throttle Response: Shortening the intake path or straightening the piping can provide a more direct path for air to your engine, improving throttle response.
Induction Noise: Cone filters produce an aggressive induction sound as a byproduct of increased airflow, a characteristic many enthusiasts find as appealing as the performance gain itself.

Performance Gains

From a cold air intake alone on a naturally aspirated vehicle, expect somewhere in the range of 5–15 horsepower. Pair your intake with an exhaust, headers, and a tune, and you can see much more meaningful power improvements.

Vehicles with a turbocharger or supercharger typically see greater benefit from intake upgrades compared to naturally aspirated vehicles. This is because a turbocharger or supercharger moves a much larger volume of air than a naturally aspirated engine, so reducing intake restriction has a proportionally larger effect on the power the engine can produce.

Intake Types

Short Ram Intake

A short ram intake replaces the factory airbox with a cone filter positioned close to the throttle body, providing a short and direct path for air to reach the engine. Short ram intakes are simple, affordable, and easy to install, making them a great choice for tight engine bays and budget builds. The downside of a short ram intake is that they typically draw in warmer air, which reduces maximum power compared to a cold air intake.

Cold Air Intake

A cold air intake relocates the filter away from hot engine bay components to draw in cooler, denser air. Since cooler air contains more oxygen per volume, this supports more power. Most cold air intakes position the filter within the engine bay but away from heat sources. More serious builds will route the filter into the fender or bumper area to access the coldest possible air. Many cold air intakes include an intake box or heat shield that isolates the filter from engine heat and protects it from debris. Cold air intakes are the preferred choice when chasing maximum performance.

Snorkel

A snorkel relocates the intake point from the engine bay to near the roofline. This provides cooler air and protection against water ingestion when driving through deep water. Snorkels are most common on off-road vehicles and are rarely seen on street or performance builds.

Filter Materials

Different filter materials have different qualities and maintenance requirements. Read our Air Filter Buyer's Guide for a full breakdown.

Compatibility

Most aftermarket air intake systems are vehicle specific. Always confirm that your intake fits your specific year, make, model, and trim. If you are sourcing intake piping separately rather than buying a complete kit, plan your routing carefully before purchasing to avoid clearance issues during installation.

Conclusion

An air intake is one of the most accessible performance modifications available. It's straightforward to install, provides meaningful power improvement, and creates a strong foundation for further modifications down the line. For most builds, a cold air intake provides the best balance of performance and value. If budget or engine bay space is a constraint, consider a short ram intake which will deliver improved throttle response. Either way, pairing your intake with an exhaust system and a tune will multiply the gains well beyond what the intake delivers on its own. You can find all the parts you need and plan your build on RideBuilder.