GrimmSpeed Post MAF Hose Kit - Red - 2015-2021 Subaru WRX

Enhancing Airflow and Structural Integrity: GrimmSpeed Post MAF Hoses

Our Post MAF Hose construction elevates beyond OE standards, boasting two key features for optimal performance:

1. Smooth Inner Surface: The GrimmSpeed Post MAF Hoses feature a smooth inner surface, eliminating the pockets found in OE structural corrugated folds. Crafted from 4-ply silicone, our hoses surpass competitors by integrating an internal stainless steel wire along their length. This dual construction ensures flexibility while retaining robust structural properties, preventing collapse under vacuum and maximizing airflow efficiency.

2. Tapered End Portions: Addressing the critical details, our hoses incorporate tapered end portions to match the inner diameter of the OEM air box and turbo inlet. Mismatched diameters in other offerings create disruptive steps, causing airflow interruptions and generating vortexes in the post MAF hoses. GrimmSpeed's design is meticulously crafted to mitigate these issues, ensuring optimal airflow trajectories.

Methodology: To enhance an existing component, understanding its limitations is key. The OEM rubber hoses feature sharp angles and corrugated folds, leading to uneven airflow with high and low-pressure zones. In contrast, GrimmSpeed's Hose design minimizes curve transitions and maintains a perfectly smooth interior, promoting consistent airflow to the turbo. Upgrade to GrimmSpeed for a seamless blend of enhanced performance and structural integrity.

The tapered portion is also an important design choice for contributing to even flow through the hose. A plot comparison showing vorticity (a calculation used for flow disruption) between a non-tapered version and GrimmSpeed’s Tapered Hose shows an additional reduction in turbulence:

QUICK SPECS:

• 4-Ply Stainless Steel-Reinforced Silicone - Extremely durable, yet flexible; available in red or black 
• OEM Fitment - Easy install, no modification required 
• Seamless Flow - CAD optimized design  
• High Quality Breeze Hose Clamps - Included in every kit
• No Tuning Required - Even when coupled with GrimmSpeed DRY-CON Panel Air Filter for maximum performance
• GrimmSpeed Logo to Represent your Favorite Brand!

Fitments

• 15-21 Subaru WRX