Grimmspeed Black Post MAF Hose Kit Subaru WRX 2015-2021 | 125023.1

Product Fitment:

2015-2021 Subaru WRX

Improve airflow between the mass airflow sensor and turbo inlet with the GrimmSpeed Post-MAF Hose Kit for the 2015-2021 Subaru WRX. Designed as a direct replacement for the factory corrugated rubber hose, this kit features a smooth, CAD-optimized interior that reduces turbulence and promotes more consistent airflow to the turbocharger.

Product Features

• Color: Black
• 4-ply stainless-steel-reinforced silicone
• Smooth internal surface
• CAD-optimized design
• Tapered ends for improved airflow
• OEM-style fitmentt
• No permanent modifications required
• Includes high-quality hose clamps
• No tuning required
• Designed to prevent hose collapse under vacuum
• Flexible yet structurally reinforced construction

Improved Airflow Design

The factory post-MAF hose uses corrugated sections that can create turbulence and uneven airflow as air travels toward the turbocharger.

The GrimmSpeed hose replaces those corrugated sections with a smooth internal surface, allowing air to travel more consistently through the intake tract.

The tapered ends provide a smoother transition between the hose, factory airbox, and turbo inlet, helping minimize abrupt changes in diameter that can disrupt airflow.

Stainless-Steel Reinforced Silicone

The hose is constructed from 4-ply silicone with internal stainless-steel wire reinforcement.

This construction provides:

• Excellent durability
• Increased flexibility
• Improved structural strength
• Resistance to collapsing under vacuum
• Long-term reliability in the engine bay

Performance Benefits

• Smoother airflow
• Reduced turbulence
• Improved airflow consistency
• Better transition into the turbo inlet
• Reduced restriction compared with the factory corrugated design
• Helps maximize the efficiency of other intake upgrades
• No ECU tuning required