Grimmspeed GRM125034 V2 Cast Aluminum Turbo Inlet Pipe

The GrimmSpeed GRM125034 Version 2 Cast Aluminum Turbo Inlet is a direct bolt-on replacement for the factory plastic turbo inlet pipe, connecting the air filter to the turbocharger compressor inlet. The OEM plastic inlet is a known weak point — over time it becomes brittle and prone to cracking around the BPV and turbo flange, which can lead to unmetered air entering the engine and dangerous boost leaks. This cast aluminum upgrade solves that problem permanently.

GrimmSpeed engineered this inlet using precision laser scanning and a Faro Arm measuring system to capture exact OEM geometry, then used multiple 3D-printed prototypes to refine real-world fitment and airflow. The result is a CAD-optimized design that eliminates the air pockets found in the OEM inlet, delivering smoother, more unrestricted airflow to the turbocharger.

What's New in Version 2:

• Consolidated fitment — a single kit now covers both 2015–2016 and 2017–2021 WRX models via interchangeable threaded fittings for the PCV return line
• Eliminates the need for separate part numbers for early and late model years

Key Features:

• A380 Cast Aluminum Construction — extremely durable, permanently eliminates OEM cracking issues
• CNC Machined after casting for precise fit and superior sealing surfaces
• OEM Fitment — easy installation with no cutting, welding, or modification required
• Seamless Airflow — CAD-optimized interior eliminates OEM air pockets for improved flow characteristics
• No Tuning Required — compatible with stock tune, even when paired with the GrimmSpeed DRY-CON Panel Air Filter and Post MAF Hoses
• High-Quality Breeze Clamps and Viton O-ring included in every kit

What's Included:

• GrimmSpeed V2 Cast Aluminum Turbo Inlet
• Couplers
• High-quality Breeze clamps
• Viton O-ring
• Hardware

Installation Note: This turbo inlet is designed to interface perfectly with the GrimmSpeed Electronic Boost Control Solenoid. When used with the OEM or other aftermarket boost control solenoids, washers or longer bolts may be required for proper mounting. Not compatible with 2017–2021 Canadian-spec WRX models that came from the factory with a cast aluminum inlet featuring integrated coolant passages.

Alternate Part Numbers: 125034, GRM125034 | UPC: 850037989805 | Supersedes: 125027