{"product_id":"post-maf-hose-kit-red-2002-07-subaru-wrx-2004-07-subaru-sti","title":"GrimmSpeed Post-MAF Hose Kit - Red - 2002-07 Subaru WRX, 2004-07 Subaru STI GRM125010","description":"\u003ch2 data-mce-fragment=\"1\"\u003e\u003cspan lang=\"EN\" data-mce-fragment=\"1\"\u003eAdd a touch of class to your bay!\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003ciframe src=\"https:\/\/www.youtube.com\/embed\/6kIkgY8qgU0?fs=1\" height=\"330\" width=\"440\" data-mce-fragment=\"1\" data-mce-src=\"https:\/\/www.youtube.com\/embed\/6kIkgY8qgU0?fs=1\" allowfullscreen=\"\" frameborder=\"0\"\u003e\u003c\/iframe\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan lang=\"EN\" data-mce-fragment=\"1\"\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 data-mce-fragment=\"1\"\u003e\u003cspan lang=\"EN\" data-mce-fragment=\"1\"\u003eOur hose construction improves flow with 2 main features:\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan lang=\"EN\" data-mce-fragment=\"1\"\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 data-mce-fragment=\"1\"\u003e\u003cspan lang=\"EN\" data-mce-fragment=\"1\"\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 data-mce-fragment=\"1\"\u003e\u003cspan lang=\"EN\" data-mce-fragment=\"1\"\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__\" data-mce-fragment=\"1\" data-mce-src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0743\/3165\/2402\/files\/postmafhose-tapertapered-portions.jpg?v=1704988140\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan lang=\"EN\" data-mce-fragment=\"1\"\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 data-mce-fragment=\"1\"\u003e\u003cspan lang=\"EN\" data-mce-fragment=\"1\"\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 data-mce-fragment=\"1\"\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=\" data-mce-fragment=\"1\" data-mce-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 data-mce-fragment=\"1\"\u003e\u003cspan lang=\"EN\" data-mce-fragment=\"1\"\u003eTESTING:\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan lang=\"EN\" data-mce-fragment=\"1\"\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 data-mce-fragment=\"1\"\u003e\u003cspan lang=\"EN\" data-mce-fragment=\"1\"\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__\" data-mce-fragment=\"1\" data-mce-src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0743\/3165\/2402\/files\/postmafhose-slidesoem-vs-grimmspeed.jpg?v=1704988103\"\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan lang=\"EN\" data-mce-fragment=\"1\"\u003eThe removal of the corrugated folds also adds a significant reduction in\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003cem data-mce-fragment=\"1\"\u003evorticity\u003cspan data-mce-fragment=\"1\"\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 data-mce-fragment=\"1\"\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__\" data-mce-fragment=\"1\" data-mce-src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0743\/3165\/2402\/files\/postmafhose-slidesoem-vs-grimmspeed-flow-rate.jpg?v=1704988118\"\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan lang=\"EN\" data-mce-fragment=\"1\"\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 data-mce-fragment=\"1\"\u003e\u003cspan lang=\"EN\" data-mce-fragment=\"1\"\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__\" data-mce-fragment=\"1\" data-mce-src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0743\/3165\/2402\/files\/postmafhose-slidesoem-vs-grimmspeed-flow-rate-copy.jpg?v=1704988137\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003e\u003cspan lang=\"EN\" data-mce-fragment=\"1\"\u003eQUICK SPECS:\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul data-mce-fragment=\"1\"\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003e\u003cspan lang=\"EN\" data-mce-fragment=\"1\"\u003e4-Ply Reinforced Silicone\u003c\/span\u003e\u003c\/strong\u003e\u003cspan lang=\"EN\" data-mce-fragment=\"1\"\u003e- Extremely durable avail. in red or black\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003e\u003cspan lang=\"EN\" data-mce-fragment=\"1\"\u003eOEM fitment\u003c\/span\u003e\u003c\/strong\u003e\u003cspan lang=\"EN\" data-mce-fragment=\"1\"\u003e- Easy install, no modification or tuning required\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003e\u003cspan lang=\"EN\" data-mce-fragment=\"1\"\u003eSeamless Flow\u003c\/span\u003e\u003c\/strong\u003e\u003cspan lang=\"EN\" data-mce-fragment=\"1\"\u003e- CAD optimized design\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003e\u003cspan lang=\"EN\" data-mce-fragment=\"1\"\u003eHigh Quality Breeze Hose Clamps Included\u003c\/span\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003e\u003cspan lang=\"EN\" data-mce-fragment=\"1\"\u003eGrimmSpeed Logo to Represent your Favorite Brand!\u003c\/span\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003e\u003cspan lang=\"EN\" data-mce-fragment=\"1\"\u003eFITMENT:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul data-mce-fragment=\"1\"\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\u003cspan lang=\"EN\" data-mce-fragment=\"1\"\u003e2002-07 Subaru WRX\u003c\/span\u003e\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\u003cspan lang=\"EN\" data-mce-fragment=\"1\"\u003e2004-07 Subaru STI\u003c\/span\u003e\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\u003cspan lang=\"EN\" data-mce-fragment=\"1\"\u003e2004-08 Subaru Forester XT\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003e\u003cspan lang=\"EN\" data-mce-fragment=\"1\" mce-data-marked=\"1\"\u003eINSTALLATION:\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul data-mce-fragment=\"1\"\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0743\/3165\/2402\/files\/GrimmSpeed_PostMAFHose_InstallGuide_v1.pdf\" data-mce-fragment=\"1\" data-mce-href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0743\/3165\/2402\/files\/GrimmSpeed_PostMAFHose_InstallGuide_v1.pdf\"\u003e\u003cspan lang=\"EN\" data-mce-fragment=\"1\"\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":42439783022775,"sku":"GRM125010","price":89.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0574\/6429\/1511\/files\/GrimmSpeed_PostMAFHose_15_1200px__25338.jpg?v=1711003408","url":"https:\/\/milkymotorsports.com\/products\/post-maf-hose-kit-red-2002-07-subaru-wrx-2004-07-subaru-sti","provider":"Milky Motorsports","version":"1.0","type":"link"}