{"product_id":"grimmspeed-post-maf-hose-kit-black-2008-2014-subaru-wrx-2008-2021-subaru-sti","title":"GrimmSpeed Post-MAF Hose Kit Black - 2008-2014 Subaru WRX \/ 2008-2021 Subaru STI","description":"\u003cp class=\"product-title h5\"\u003e\u003cstrong\u003e125011\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cspan lang=\"EN\"\u003eAdd a touch of class to your bay!\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cdiv class=\"youtube-container no-container\"\u003e\n\u003ciframe src=\"https:\/\/www.youtube.com\/embed\/6kIkgY8qgU0?fs=1\" height=\"330\" width=\"440\" class=\"no-container\"\u003e\u003c\/iframe\u003e\n\u003cdiv class=\"loader\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan lang=\"EN\"\u003eSome 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. We’ve now got you covered with The GrimmSpeed Post MAF Hose Kit that not only looks better, but fixes the flaws of its OE counter part.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan lang=\"EN\"\u003eOur hose construction improves flow with 2 main features:\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan lang=\"EN\"\u003eThe first is the smooth inner surface, removing the pockets from the OE corrugated folds. These folds are necessary for the factory rubber design for flexibility during installation and structural integrity. The Grimmspeed hose is made with reinforced silicone, which is flexible, but has strong structural properties that enable us to have a hose that is very easy to install without worrying about collapsing under vacuum.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan lang=\"EN\"\u003eThe 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:\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan lang=\"EN\"\u003e\u003cimg height=\"300\" width=\"354\" alt=\"postmafhose-tapertapered-portions.jpg\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0743\/3165\/2402\/files\/postmafhose-tapertapered-portions.jpg?v=1704988140\" title=\"postmafhose-tapertapered-portions.jpg\" class=\"__mce_add_custom__\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan lang=\"EN\"\u003eCoupled with The GrimmSpeed DRY-CON Panel Air Filter, this will be the best way to maximize your factory intake system until it’s time to upgrade into a full GrimmSpeed Intake.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan lang=\"EN\"\u003eNote: If you’ve got a 2015-17 STI with the factory sound generator tube and want to delete that piece, you can either purchase the\u003cspan\u003e \u003c\/span\u003e\u003ca href=\"https:\/\/admin.shopify.com\/store\/grimmspeed-apg\/products\/%3E15-17%20post%20MAF%20hose%3C\/a%3E%20%3Cstrong%3Eand%3C\/strong%3E%20%3Ca%20href=\"\u003eGrimmSpeed Sound Plug Delete\u003c\/a\u003e, or opt for the 18+ STI hose to eliminate the sound tube provision altogether.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan lang=\"EN\"\u003eTESTING:\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan lang=\"EN\"\u003eThe first step in improving on an existing part is to find its shortcomings. The OEM rubber hose, designed with the corrugated folds, requires a straight section in the middle, which means sharper curves on both ends. This contributes to uneven air flow through the hose with high and low pressure spots. The GrimmSpeed hose design can support a minimal curve transition, maximizing air flow. The plot below shows the pressure through the length of the hose, the GrimmSpeed design resulting in a smoother transition from the air box into the turbo inlet:\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan lang=\"EN\"\u003e\u003cimg height=\"300\" width=\"547\" alt=\"postmafhose-slidesoem-vs-grimmspeed.jpg\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0743\/3165\/2402\/files\/postmafhose-slidesoem-vs-grimmspeed.jpg?v=1704988103\" title=\"postmafhose-slidesoem-vs-grimmspeed.jpg\" class=\"__mce_add_custom__\"\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan lang=\"EN\"\u003eThe removal of the corrugated folds also adds a significant reduction in\u003cspan\u003e \u003c\/span\u003e\u003cem\u003evorticity\u003cspan\u003e \u003c\/span\u003e\u003c\/em\u003e(a calculation used for flow disruption, with blue representing consistent flow and red more turbulent) between the two designs. Smoother flow will give us a more consistent air supply to the turbo:\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg height=\"300\" width=\"516\" alt=\"postmafhose-slidesoem-vs-grimmspeed-flow-rate.jpg\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0743\/3165\/2402\/files\/postmafhose-slidesoem-vs-grimmspeed-flow-rate.jpg?v=1704988118\" title=\"postmafhose-slidesoem-vs-grimmspeed-flow-rate.jpg\" class=\"__mce_add_custom__\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan lang=\"EN\"\u003eThe tapered center portion is also an important design choice for contributing to even flow through the hose. A plot comparison showing vorticity between a non-tapered version and Grimmspeed’s tapered hose shows an additional reduction in turbulence through the center of the hose where a majority of air flow will occur:\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan lang=\"EN\"\u003e\u003cimg height=\"300\" width=\"598\" alt=\"postmafhose-slidesoem-vs-grimmspeed-flow-rate-copy.jpg\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0743\/3165\/2402\/files\/postmafhose-slidesoem-vs-grimmspeed-flow-rate-copy.jpg?v=1704988137\" title=\"postmafhose-slidesoem-vs-grimmspeed-flow-rate-copy.jpg\" class=\"__mce_add_custom__\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan lang=\"EN\"\u003eQUICK SPECS:\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan lang=\"EN\"\u003e4-Ply Reinforced Silicone\u003c\/span\u003e\u003c\/strong\u003e\u003cspan lang=\"EN\"\u003e- Extremely durable avail. in red or black\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan lang=\"EN\"\u003eOEM fitment\u003c\/span\u003e\u003c\/strong\u003e\u003cspan lang=\"EN\"\u003e- Easy install, no modification or tuning required\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan lang=\"EN\"\u003eSeamless Flow\u003c\/span\u003e\u003c\/strong\u003e\u003cspan lang=\"EN\"\u003e- CAD optimized design\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e\u003cspan lang=\"EN\"\u003eHigh Quality Breeze Hose Clamps Included\u003c\/span\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e\u003cspan lang=\"EN\"\u003eGrimmSpeed Logo to Represent your Favorite Brand!\u003c\/span\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003e\u003cspan lang=\"EN\"\u003eFITMENT:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan lang=\"EN\"\u003e2008-21 Subaru STI\u003cspan\u003e \u003c\/span\u003e\u003cem\u003e(2015-17 with OEM Sound Generator Tube Deleted)\u003c\/em\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan lang=\"EN\"\u003e2015-17 Subaru STI\u003cem\u003e\u003cspan\u003e \u003c\/span\u003e(With OEM Sound Generator Tube Installed)\u003c\/em\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan lang=\"EN\"\u003e2008-14 Subaru WRX\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan lang=\"EN\"\u003e2005-09 Subaru Legacy GT\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan lang=\"EN\"\u003e2005-09 Subaru Outback XT\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan lang=\"EN\"\u003e2009-13 Subaru Forester XT\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cspan lang=\"EN\"\u003eINSTALLATION:\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0743\/3165\/2402\/files\/GrimmSpeed_PostMAFHose_InstallGuide_v1.pdf?v=1707362270\"\u003e\u003cspan lang=\"EN\"\u003eGrimmSpeed Post MAF Hose Kit Install\u003c\/span\u003e\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Grimmspeed","offers":[{"title":"Default Title","offer_id":43025370054723,"sku":"GRM125011","price":140.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0278\/0456\/5571\/files\/GrimmSpeed_PostMAFHose_12_1200px__86056.webp?v=1772832427","url":"https:\/\/gumotorsport.com\/products\/grimmspeed-post-maf-hose-kit-black-2008-2014-subaru-wrx-2008-2021-subaru-sti","provider":"GUMOTORSPORT","version":"1.0","type":"link"}