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The COBB Tuning Subaru Turbo Inlet 745450 is a critical upgrade for FA20 Subaru engines, specifically engineered for the 2015-2021 WRX and 2014-2018 Forester XT. This robust cast aluminum turbo inlet replaces the restrictive and failure-prone factory brittle plastic inlet. It's design & construction improves airflow efficiency, durability, and long-term reliability. This also replaces the brittle factory BPV connection with a robust reinforced silicone coupler to eliminate common leaks.
The OEM turbo inlet is a known weak point on FA20DIT engines, often cracking or warping after repeated heat cycles, which can lead to unmetered air leaks and inconsistent boost delivery. COBB solves this problem with a precision-cast aluminum inlet that maintains its shape under extreme conditions while offering a significantly smoother and less restrictive airflow path to the turbocharger.
Featuring an enlarged 70mm inlet diameter and a port-matched outlet designed to mate seamlessly with the factory turbo compressor inlet, this turbo inlet reduces pressure drop before the turbo, helping the turbocharger operate more efficiently. Thoughtful design elements such as threaded ports for OEM PCV and EVAP fittings, reinforced silicone couplers, and provisions for both stock and aftermarket electronic boost control solenoids; making this a true bolt-on performance upgrade.
Whether you are maintaining a stock daily driver or building a tuned Subaru with future power goals, the COBB Cast Turbo Inlet provides a reliable foundation for improved airflow and consistent boost performance.
While a turbo inlet upgrade alone does not typically produce large peak horsepower gains without tuning, the COBB Cast Turbo Inlet significantly improves airflow efficiency before the turbocharger. By reducing inlet restriction and eliminating turbulence caused by the factory plastic inlet, the turbo can spool quicker.
Common real-world performance benefits reported by enthusiasts include improved throttle response, smoother boost delivery, and faster turbo spool. When combined with supporting modifications such as an intake, intercooler, and proper ECU calibration, this inlet supports higher airflow demands and helps unlock additional horsepower and torque potential.
Exact power gains vary based on vehicle setup, tuning, and supporting modifications, but this turbo inlet is widely regarded as a foundational airflow upgrade for tuned FA20DIT applications. By itself paired with a tune you could expect 5-10hp.
The factory inlet is made of plastic and can crack or deform over time. The COBB inlet is cast aluminum, which resists heat and pressure while also providing a smoother and less restrictive opening for airflow to the turbo. The inlet ID has been expanded to 70mm, a 5mm increase compared to OEM and the outlet is 2mm larger than stock.
On a completely stock vehicle, gains will be limited but slightly improved throttle response and turbo spool. For measurable horsepower increases, tuning and additional airflow and fueling upgrades are recommended.
A tune is not strictly required for basic operation, but tuning is highly recommended—especially when combined with other performance modifications—to fully optimize airflow and drivability.
Yes, the COBB Cast Turbo Inlet is compatible with most aftermarket intake systems designed for the factory turbo inlet size and MAF configuration.
No, installation can be completed with basic hand tools. However, a re-tune is recommended after installation to take full advantage of the increased airflow.
Aftermarket modifications can affect warranty coverage depending on the dealership and circumstances. While the part itself does not automatically void a warranty, related engine or drivetrain claims may be impacted.
Yes, this can be used with your factory or aftermarket boost controller. It comes with two different sized fasteners to accept either one.
COBB Tuning provides a limited 12-month warranty against defects in materials and workmanship for this product when purchased from an authorized dealer. This warranty applies to the original purchaser and does not cover damage caused by misuse, improper installation, racing use, or unauthorized modification.
Warranty claims require proof of purchase and are subject to COBB Tuning’s standard warranty policies.
SKU:COBB745450 ,UPC: ,Availability:
Perrin Performance
