Fixes the OEM boost leak | BIG Aftermarket Turbo Ready

Ditch your VB WRX’ leaky factory turbo inlet and upgrade to the OVERTAKE Aluminum BIG TURBO Inlet. Designed for 2022+ Subaru WRX' with larger aftermarket turbos, this high-strength aluminum piece increases airflow and improves on two big flaws in the factory inlet, allowing for superior intake temperatures and better boost response.

If you are running an upgraded turbocharger on your FA24, this option is perfect for you! Our standard 2022+ WRX Aluminum Turbo Inlet is designed around the stock inlet diameter of 49.5mm, but we have opened up the BT Version turbo flange to 54.5mm to account for larger aftermarket turbochargers like the Boost Lab BL54XR.

Key Benefits:

• 54.5 mm turbo inlet diameter - perfect match for upgraded aftermarket turbochargers like the BL45XR

• Eliminates persistent boost leak that is present with the OEM Subaru inlet

• No more coolant heating up the air entering your engine

• Ensures consistent, metered airflow for better engine efficiency

• Supports future intake upgrades for even more performance

The factory inlet is aluminum, how is OVERTAKE's any different?

Modern vehicles must prevent fuel vapors from escaping the gas tank, instead routing them to the engine so they can be burned off. When the engine is off, the entire system is sealed - hence the importance of a good gas-cap seal. At idle and under vacuum (no boost), a purge solenoid periodically opens and draws vapors directly into the intake manifold. Under light boost (0–4 psi), manifold pressure is too high to draw vapors in, so the solenoid instead routes them to the turbo inlet, where the natural pressure drop through the air intake creates enough suction. However, there is a flaw in this design. The EVAP sensor is located far away from the inlet and there is a long hose run between the two. This can lead to weak readings at the sensor. To remedy this, Subaru introduced a "band-aid" fix by drilling a 4mm hole into the turbo’s compressor housing feeding a venturi-style “ejector.” This intentional boost leak increases airflow through a small channel on the factory inlet, generating an artificial vacuum so the sensor always detects the expected pressure drop while vapors continue entering the turbo.

At wide-open throttle, the purge solenoid closes, holding the vapors in the tank, but the "ejector" continues leaking boost across the venturi into the turbo inlet. As a result, the turbo must spin faster to maintain target boost, raising charge temperatures, reducing intercooler efficiency, and limiting top-end airflow and boost potential. As a precaution, Subaru circulates coolant under the turbo inlet to keep the venturi from freezing, which would disable the EVAP system entirely. This coolant flow drastically heats up the factory turbo inlet to around 200 degrees Fahrenheit, which in-turn heats the air entering your turbo, leading to decreased performance potential.

As an alternative, the OVERTAKE Turbo Inlet utilizes the engine’s vacuum pump as a direct source to constantly supply only the necessary vacuum level, and places the source closer to the sensor. This pump is only utilized for the power braking system in the factory setup, so as to ensure our kit does not hinder braking performance at all, we include an inline restrictor pill to limit the vacuum levels to the required amount for the sensor to read properly. This preserves proper fuel vapor management, without relying on Subaru’s built-in boost leak. Since we have eliminated the potential for the small ejector orifice to freeze over, we can also bypass the coolant loop through the inlet, which also greatly improves performance potential by allowing fresh, cool air from your intake to enter the compressor side of the turbocharger.

On top of all of this, the factory Subaru turbo inlet features a couple of internal pockets which are meant to dampen induction sound and increase surface area for inlet warming. These pockets also greatly disrupt the air entering your turbocharger. Our inlet ditches them, allowing for a smooth path of flow and increased intake air velocity.

In The Box: 

(1) Overtake Aluminum Turbo Inlet - Big Turbo
(1) Billet PCV Adapter (2022-24 models)
(1) Aluminum EVAP Fitting
(2) M6x1-12mm Button Head Screws
(2) -918 O-Ring
(2) -113 O-Ring
(2) -016 O-Ring
(2) -140 O-Ring
(1.5 Feet) 1/2" Heater Hose
(1.5 Feet) 3/8" Fuel Line Hose
(2 Feet) 1/4" Fuel Line Hose
(2) 3/8" x 1/4" Barbed T-Fitting
(1) 1/2" Barb Coupler
(1) Brass Restrictor Pill
(2) 12mm Constant Tension Clamps
(6) 15mm Constant Tension Clamps