{"product_id":"stealthbox-cold-air-intake-red-2015-21-subaru-wrx","title":"GrimmSpeed StealthBox Cold Air Intake - Red - 2015-21 Subaru WRX GRM060067","description":"\u003cp data-mce-fragment=\"1\"\u003eInspiration for the StealthBox Intake came from internal discussions about what we wanted from an intake system for the 2015-21 Subaru WRX. Of course performance is the highest priority, but at GrimmSpeed so much more than that goes into a product. We wanted an intake that purred quietly under normal driving circumstances, but would roar at wide open throttle. We wanted an intake that looked at home in the well-sported 2015-21 WRX engine bay instead of a shoebox stuffed into the fender area. From here, the SteathBox was born. We took the concept one step further and referenced the F-117 Nighthawk as inspiration for the stealthy look of the GrimmSpeed heat shield. It should come as no surprise that the performance it packs is equally unique.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cimg data-mce-fragment=\"1\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0743\/3165\/2402\/files\/intake_fa20_wrx_GB_5_2000_600x600.jpg?v=1705961008\" alt=\"\" data-mce-src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0743\/3165\/2402\/files\/intake_fa20_wrx_GB_5_2000_600x600.jpg?v=1705961008\"\u003e\u003c\/p\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eQUICK SPECS:\u003c\/h3\u003e\n\u003cul data-mce-fragment=\"1\"\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003e+32wtq (14.3%) and +21whp (9.6%)\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eDesigned in CAD\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003c\/strong\u003e- Perfect mating with the factory turbo and ram-air scoop\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eLow bend angle aluminum tube\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e- Minimize restriction and maximize performance\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eShielded MAF sensor placement\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e- Protects MAF from heat, which increases accuracy of readings\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eMade in the USA\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e- Manufactured right here in Minnesota\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eDESIGN:\u003c\/h3\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eMAF diameter and placement, total bend angle, filter location, and heat shield design were the primary variables during the design phase. To ensure accurate readings, unaffected by the intense heat of the engine bay, MAF sensor placement absolutely must be within the heat shield. To minimize restriction, it was important to keep the total bend angle in the intake tube as low as possible, but still raise the filter location away from the ground to protect it from the elements. Lastly, testing showed the importance of utilizing the factory ram air scoop to feed the otherwise stagnant air in front of the fender.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e\u003cimg data-mce-fragment=\"1\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0743\/3165\/2402\/files\/intake_fa20_wrx_GB_6_original_600x600.jpg?v=1705961040\" alt=\"\" data-mce-src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0743\/3165\/2402\/files\/intake_fa20_wrx_GB_6_original_600x600.jpg?v=1705961040\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eOur engineers created a 3D model of the intake system and fender area in order to optimize each of these variables. The result is an intake with a total bend angle of 74 degrees, and a filter that is placed neatly within the fender, such that it offers protection from the elements without being unnecessarily exposed to the heat of the engine bay. Lastly, the shape of the heat shield follows that of the factory air scoop, feeds the filter with fresh air evenly and promotes swirl which prevents pockets of motionless air on the cold side of the shield.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eWe have made the decision not to sell the intake without the heat shield. It seems that others have done this to hit a lower price point at the cost of performance. We'd prefer that everybody using a GrimmSpeed StealthBox Intake have the best possible experience and the use of the heat shield is critical to the function of the intake system.\u003c\/p\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eMATERIALS AND FABRICATION:\u003cbr data-mce-fragment=\"1\"\u003e\n\u003c\/h3\u003e\n\u003cp data-mce-fragment=\"1\"\u003eEach intake begins with a CNC bent and laser cut 6061 Aluminum tube. Contrary to popular belief, particularly from those producing composite intakes, we found that the increased thermal mass of using thicker aluminum tubing (1\/8” wall thickness) kept the intake from being vulnerable to rapid temperature change. This is called the ‘thermal flywheel effect’ and will keep the rapidly fluctuating temperatures inside your engine bay from affecting intake temps as drastically.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eCustom MAF flanges are machined from the same 6061 alloy and are placed on the straight nearest the filter, where we observed the most consistent cross-sectional flow. Mounting brackets are laser cut from 3\/16” thick aluminum plate and CNC bent for perfect and repeatable fitment. Finally, heat shields are laser cut, CNC bent and hand assembled before going to powdercoating for a durable wrinkle black finish.\u003c\/p\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003ePERFORMANCE:\u003cbr data-mce-fragment=\"1\"\u003e\n\u003c\/h3\u003e\n\u003cp data-mce-fragment=\"1\"\u003eDyno testing and long-term road testing are where all of this theory meets reality. Knowing that the same application of these design techniques resulted in intakes that performed extremely well on both the BRZ\/FR-S and the 08-14 WRX\/STI, we were confident in our chosen configuration. Dyno testing and tuning verified the intakes ability to make power and 6mos of road testing through winter\/spring in Minnesota confirmed real-world performance.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eWe chose to use the exact same pull that tested the performance of our J-Pipe\/Downpipe as the baseline for our 2015 WRX. This proves that our baseline is not somehow artificially low. We then installed the intake and had the car retuned using the same boost levels and air fuel ratios (AFRs). This is an extremely important part of evaluating an intake system. If the before and after results aren’t showing the same boost levels or AFRs, performance increases can be attributed to tuning rather than to the performance of the intake hardware itself. The chart below shows the before and after just described with both boost and AFR plotted along with whp and wtq. It should be noted that the stock baseline for this car was 174whp, so this particular dyno reads very low.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e\u003cimg data-mce-fragment=\"1\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0743\/3165\/2402\/files\/intake_2015wrx_dyno_beforeandafter_2_600x600.jpg?v=1705961077\" alt=\"\" data-mce-src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0743\/3165\/2402\/files\/intake_2015wrx_dyno_beforeandafter_2_600x600.jpg?v=1705961077\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cdiv data-mce-fragment=\"1\" style=\"display: block;\" id=\"installguide\" data-mce-style=\"display: block;\"\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eThe GrimmSpeed intake produced an additional 32ftlb (14.3%) at 3000rpm and 21whp (9.6%) at 5500rpm, with healthy gains all the way across both curves. As mentioned before, the AFR and Boost curves are also included to demonstrate that the gains shown are from the intake alone, not the manipulation of other variables.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eAs with any intake for the 2015-21 WRX, tuning is required after installation to maximize gains and safety.\u003c\/p\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eINCLUDED:\u003cbr data-mce-fragment=\"1\"\u003e\n\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e1x CNC bent intake tube w\/ MAF flange\u003c\/li\u003e\n\u003cli\u003e1x GrimmSpeed high-flow dry air filter\u003c\/li\u003e\n\u003cli\u003e1x Aluminum heat shield\u003c\/li\u003e\n\u003cli\u003e1x 12\" MAF harness extension\u003c\/li\u003e\n\u003cli\u003e1x Silicon hump coupler\u003c\/li\u003e\n\u003cli\u003e3x Stainless steel worm gear clamp\u003c\/li\u003e\n\u003cli\u003e3x Rubber gasket material cut-to-length\u003c\/li\u003e\n\u003cli\u003e2x MAF sensor machine screws\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eFITMENT:\u003cbr data-mce-fragment=\"1\"\u003e\n\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e2015-21 Subaru WRX\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eINSTALLATION:\u003c\/h3\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003ciframe data-mce-fragment=\"1\" width=\"440\" height=\"330\" src=\"https:\/\/www.youtube.com\/embed\/HbenWRY5uMw?fs=1\" frameborder=\"0\" allowfullscreen=\"\" data-mce-src=\"https:\/\/www.youtube.com\/embed\/HbenWRY5uMw?fs=1\"\u003e\u003c\/iframe\u003e\u003c\/p\u003e\n\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0743\/3165\/2402\/files\/GrimmSpeed_2015-2016_WRX_Intake_Install_Guide.pdf\"\u003e\u003cspan data-mce-fragment=\"1\" style=\"font-size: medium;\" data-mce-style=\"font-size: medium;\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\" style=\"text-decoration: underline;\" data-mce-style=\"text-decoration: underline;\"\u003eWritten - 2015-21 WRX GrimmSpeed Intake Installation Guide\u003c\/span\u003e\u003c\/strong\u003e\u003c\/span\u003e \u003c\/a\u003e\n\u003c\/div\u003e","brand":"GRIMMSPEED","offers":[{"title":"Default Title","offer_id":42439811498167,"sku":"GRM060067","price":425.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0574\/6429\/1511\/files\/060067_Intake_Red_2015WRX_1_2000__16663.jpg?v=1711004037","url":"https:\/\/milkymotorsports.com\/products\/stealthbox-cold-air-intake-red-2015-21-subaru-wrx","provider":"Milky Motorsports","version":"1.0","type":"link"}