Grimmspeed Post MAF Hose Kit Red 2008-2014 WRX / 2008-2021 STI / 2005-2009 Legacy GT / 2009-2013 Forester XT / 2005-2009 Outback XT

Some OE parts do the job, others fall short—especially the post-MAF hose. The GrimmSpeed Post-MAF Hose Kit is designed to replace the factory hose with a better-looking, higher-performing solution that fixes its shortcomings.

Quick Specs:

• 4-ply reinforced silicone, available in red or black
• OEM-fit, no modifications or tuning required
• CAD-optimized, seamless flow design
• High-quality Breeze hose clamps included
• GrimmSpeed logo for a clean, branded look

Why Upgrade?

• Smooth Interior: Removes the corrugated folds found in the OE hose, eliminating turbulence and providing consistent airflow to your turbo.
• Tapered Center Section: Matches the air box and turbo inlet diameters, reducing steps and vortexes that disrupt flow.
• Reinforced Silicone Construction: Flexible yet strong, the hose resists collapsing under vacuum and installs easily.

When paired with the GrimmSpeed DRY-CON Panel Air Filter, this hose maximizes your factory intake system until a full GrimmSpeed Intake upgrade.

STI Sound Tube Note:
2015-17 STI owners with the factory sound generator tube can delete it using the GrimmSpeed Sound Plug Delete, or use the 2018+ STI hose to eliminate the sound tube provision altogether.

Tested & Engineered:
GrimmSpeed analyzed OEM airflow shortcomings, including uneven pressure zones and high turbulence caused by corrugated folds. Our hose reduces turbulence, improves flow consistency, and smooths the transition from the air box to the turbo inlet for better overall performance.