COBB Cast Turbo Inlet Hose Subaru WRX (2015–2021) Cast Aluminum - 745450

Fitment Information

• Subaru WRX (2015, 2016, 2017, 2018, 2019, 2020, 2021) 

Emissions Compliance

• 50 State Legal - This part is legal for sale and use on Emissions Controlled Vehicles in all 50 states when used in accordance with the manufacturer's application guide because it has a California Air Resources Board (CARB) Executive Order (EO) number: D-660-82
  

Specs & Features

• Indestructible Construction: Cast Aluminum design completely eliminates the cracking and failure issues common with the stock plastic inlet.
• Optimized Airflow: Features a massively expanded 70mm Inner Diameter (5mm larger than stock) for superior volume and velocity.
• Precision Fitment: The outlet is port-matched to the factory compressor inlet (50mm) with a captive O-ring for a guaranteed leak-free seal.
• Smart Integration: Includes mounting points for both stock and COBB Electronic Boost Control Solenoids, plus threaded ports for all factory PCV and EVAP fittings.
• Leak-Proof BPV Connection: Replaces the flimsy factory connection with a robust, reinforced silicone coupler.
• Tuning Friendly: engineered to work seamlessly with COBB Off-The-Shelf (OTS) Maps and Stage Packages.

Product Description

Plastic has no place in a high-heat turbo environment. The factory turbo inlet on the 2015-2021 WRX is made from hardened plastic that gets brittle after years of heat cycling. Eventually, it cracks—often near the connectors—leading to frustrating air leaks that kill your idle, ruin your fuel trims, and are a nightmare to diagnose. COBB Tuning solved this engineering flaw by casting the entire component in rugged aluminum. This isn't just a replacement; it is an elimination of a future failure point.

But durability is just the baseline. COBB Tuning designed this inlet to flow. By expanding the internal diameter to 70mm and smoothing out the internal geometry, this part removes restriction before the air even hits the turbo. They also addressed the notorious By-Pass Valve (BPV) connection—a common leak spot—by swapping the rigid plastic interface for a heavy-duty reinforced silicone coupler. Whether you are running a stock tune or pushing a Stage 2 build, this inlet offers the mechanical reliability you need. Don't wait for your stock part to crack and leave you stranded. Upgrade to the COBB Cast Aluminum Inlet and lock in your performance for the long haul.