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We worked hard to develop a direct replacement, dry-element air filter for the stock airbox that not only decreases restriction, producing more torque and horsepower, but is also able to filter out particulates at the same level as the OEM filter to keep your engine safe.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQUICK SPECS:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eDirect OE Replacement – Drops right into the OEM airbox for an easy install\u003c\/li\u003e\n\u003cli\u003eOil-Free Element – Dry-Con means more reliability and easier maintenance\u003c\/li\u003e\n\u003cli\u003eProven Performance: Designed in the Lab, Proven on the Dyno\n\u003cul\u003e\n\u003cli\u003eTested +9 TQ and +6 WHP – Safe, reliable power gains\u003c\/li\u003e\n\u003cli\u003e62% Better Flow than OEM – More flow\/less restriction, equals more power\u003c\/li\u003e\n\u003cli\u003e99.1% Efficiency – Filters at the same level as OEM\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003eLong Service Life – Up to 20K mile service interval\u003c\/li\u003e\n\u003cli\u003eServiceable\/Reusable – Simple refresh using popular cleaning kits\u003c\/li\u003e\n\u003cli\u003eNo Tune Required – Simply drop in and enjoy more safe, reliable power!\u003c\/li\u003e\n\u003cli\u003e1 Year Warranty – Worry free, heavy-duty construction\u003c\/li\u003e\n\u003cli\u003e100% Made in the USA\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWHY CHOOSE GRIMMSPEED?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eFilter design is a delicate balancing act, the overall goal of creating a good air filter is to find the ideal combination of flow, filtration efficiency and holding capacity. There IS a difference between simply making a unit that fits in a factory intake box and engineering a performance air filter.\u003c\/p\u003e\n\u003cp\u003eSome air filters are constructed with a cotton or synthetic media combined with an oil to increase filtering ability. This can increase flow, however it also means more difficult filter maintenance because of the need to properly re-oil the filter. We decided to use a dry-construction media, utilizing two different layers of synthetic material with varied filtering and flow abilities, resulting in very similar flow capability to the oiled media while maintaining the same filtering efficiency. Since other important variables in air filter design including the pleat pitch, count and depth can make or break the performance of a filter, extensive testing was required.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTESTING\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eWe contracted a 3rd party OEM Test Lab using SAE-5011 OEM Air Filter Standards for our initial filter designs. All of these were the same size and fitment, but used varied filter media including pleat pitch, count, depth, material and construction.\u003c\/p\u003e\n\u003cp\u003eThe first data set explores pressure drop across the filter before and after saturation since it directly relates to the performance potential of the filter. Chart 1 shows that the pressure drop of all clean and dirty filters was very similar, identifying the filtering ability of each panel. The next data set focuses on the filtration ability in each filter; Chart 2 illustrates that filters A and B allowed far too much of the test dust to flow through, with filter C being the optimal candidate for additional performance-based testing. We took the general construction of this unit and modified it into 3 different pleat variations.\u003c\/p\u003e\n\u003cp\u003eSince ultimate performance of an air filter is based on its flow ability, we wanted to see how different pleat packs would compare to the OEM filter in terms of CFM through the filter as well as dust capacity. Chart 3 illustrates that as flow increases, capacity decreases. We see that the performance of the filters has substantially increased over the OEM unit, at the slight cost of reduction in dust capacity. Arguably the most important criteria of the filter is its ability to resist the flow of contaminants. The OEM filter was found to filter at 99.7%, with all three of our test filters scoring almost identically with 99.2% or above as illustrated in chart 4. All of these filters would be exceptional choices.\u003c\/p\u003e\n\u003cp\u003eAfter this very comprehensive testing, we were able to select a design that meets the GrimmSpeed standard and best balanced the ultimate flow potential with the dust holding capacity as illustrated in Chart 5. This filter maintains the same efficiency as OEM, but has an increase in CFM by 62%. The reduction in dust holding capacity is an acceptable middle ground between the filter choices and will still retain a lengthy maintenance interval.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDYNO TESTING\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eIn order to properly evaluate the performance gains of The GrimmSpeed Dry-Con Air Filters, we did four wide open throttle pulls with the OEM air filter, then four more with our unit on a 2021 factory-tuned STI test car. The outlier run was thrown out and results were averaged as shown in Chart 6. We can see a solid 9 ft\/lbs of torque difference and a consistent 6 whp gain from 5400rpm until redline with the GrimmSpeed filters. There is reduction in restriction in the top end that shows well here and has a direct relation to the performance of the air filter.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCONCLUSION\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe GrimmSpeed Dry-Con Air Filter flows an amazing 62% better than OEM, features a 99.2% efficiency and is easy to service without the added hassle of proper re-oiling. Through testing, we saw an increase of 9 ft\/lbs of torque and 6 whp at the top end of the RPM range with no engine tuning involved.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eVehicle Fitment:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e2008-2014 Subaru WRX\u003c\/li\u003e\n\u003cli\u003e2015-2021 Subaru WRX\u003c\/li\u003e\n\u003cli\u003e2008-2014 Subaru STI\u003c\/li\u003e\n\u003cli\u003e2015-2021 Subaru STI\u003c\/li\u003e\n\u003cli\u003e2008-2013 Subaru Forester XT SH\u003c\/li\u003e\n\u003cli\u003e2013-2018 Subaru Forester XT SJ\u003c\/li\u003e\n\u003cli\u003e2004-2009 Subaru Liberty GT BL\/BP\u003c\/li\u003e\n\u003cli\u003e2010-2014 Subaru Liberty GT BM\/BR\u003c\/li\u003e\n\u003cli\u003e2014-2017 Subaru Liberty GT BN\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Aeroflow","offers":[{"title":"Default Title","offer_id":45069637615873,"sku":"060091","price":114.95,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1921\/7937\/files\/060089_2_d0592715-a17c-460b-9c72-7adb6e08daaf.jpg?v=1714519718"},{"product_id":"psr-sfb-black-wrx-sti-08-14-fxt-08-13","title":"PSR - SFB - BLACK (WRX\/STi 08-14) + (FXT 08-13)","description":"\u003cp\u003e\u003cspan style=\"font-family: Verdana; font-size: small;\"\u003ePSR Silicon Short \"FAT\" bit. 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