PRL Air Oil Separator (AOS) | 23+ Honda Civic Type R FL5

Fits:

• 2023+ Honda Civic Type R (Hatch FL5)

Note: Fully serviceable — must be drained at regular intervals; service frequency depends on climate and driving conditions.

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Modern turbocharged engines recirculate crankcase blowby gases back into the intake tract through the factory PCV system. While effective for emissions control, these gases also carry oil vapor, fuel, and moisture that can accumulate in the intake manifold over time, contributing to carbon buildup on intake valves, reducing effective fuel octane, and increasing the likelihood of detonation. The PRL Helix Air Oil Separator removes these contaminants before they're reintroduced into the intake system, helping maintain a cleaner intake path and more consistent engine operation without venting metered air or altering factory drivability.

At the core of the PRL AOS is a proprietary internal helix that creates controlled centrifugal motion within the canister. As blowby gases enter the system, heavier oil droplets, fuel, and moisture are forced outward toward the walls of the can, where they condense and collect at the bottom. The cleaned air is routed back into the intake system, preserving closed-loop operation and proper fueling behavior.

Each PRL Helix AOS is designed and produced in-house from CNC-machined 6061-T6 billet aluminum, finished with a durable hard anodized coating and paired with a laser-cut, CNC-bent 304 stainless steel mounting bracket. Custom molded reinforced rubber hoses, billet aluminum fittings, a billet check valve, and Viton O-rings are used throughout for long-term durability, chemical resistance, and a clean OEM-style installation in the FL5 engine bay.

Quick Specs

• CNC-machined 6061-T6 billet aluminum canister, hard anodized finish (Silver)
• Proprietary internal helix separation design
• Custom billet aluminum fittings and billet check valve
• Viton O-rings for superior durability and chemical resistance
• NBR reinforced rubber hoses designed for engine bay environments
• 304 stainless steel laser-cut, CNC-bent mounting bracket
• Retains closed-loop operation, doesn't interfere with emissions equipment