Grimmspeed Post MAF Hose Kit Subaru WRX 2008-2014 / STI 2008-2021

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SKU: grm125011
Availability: Out Of Stock
Type: Turbo Inlets / Air Inlets
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Fitment Information:

2008-2014 Subaru WRX

2008-2021 Subaru STI (15-17 STI W/OEM SOUND TUBE DELETE)**

Note: If you’ve got a 2015-2017 Subaru STI with the factory sound generator tube and want to delete that piece, you can either purchase the Grimmspeed Post MAF Hose Kit Subaru STI w/ OEM Sound Tube 2015-2017 and GrimmSpeed Sound Plug Delete, or opt for the 18+ STI hose to eliminate the sound tube provision altogether.

Some OE parts look passable and others miss the mark. In the case of the factory post MAF hose, the quicker you can get it out of your bay, the better. GrimmSpeed now has you covered with our all new Post MAF Hose Kit which not only looks better, but fixes the performance flaws of its OE counterpart.

Our Post MAF Hose construction improves flow with 2 main features:

The first is the smooth inner surface, removing the pockets from the OE structural corrugated folds. The GrimmSpeed Hose is made with reinforced silicone, which is flexible, but has strong structural properties that allow for a design that maximizes flow, is very easy to install and won't collapse under vacuum.

The second feature is a tapered center portion, making sure the inner diameter matches the OEM air box and turbo inlet. A mis-matched diameter creates steps, which will interrupt the air flow trajectories and create small vortexes in the post-MAF hose. The GrimmSpeed Hose was designed specifically to prevent these issues.


  • 4-Ply Reinforced Silicone - Extremely durable, available in red or black
  • OEM Fitment - Easy install, no modification or tuning required
  • Seamless Flow - CAD optimized design
  • High Quality Breeze Hose Clamps - Included in every kit
  • GrimmSpeed Logo to Represent your Favorite Brand!


WARNING: Cancer and Reproductive Harm. (

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