{"product_id":"grimmspeed-15-21-subaru-wrx-14-18-forester-equal-length-exhaust-header","title":"GrimmSpeed Equal Length Exhaust Header | 2015-2021 Subaru WRX\/2014-2018 Forester (GRM113008)","description":"\u003ch2\u003eGrimmSpeed Equal Length Exhaust Header | 2015-2021 Subaru WRX\/2014-2018 Forester\u003c\/h2\u003e\n\u003cp\u003eImprove exhaust flow and get more out of the FA20DIT twin-scroll turbo system with the GrimmSpeed Equal Length Header for the 2015-2021 Subaru WRX. Rather than simply replacing the factory manifold with larger tubing, GrimmSpeed redesigned the runner layout, collector geometry, flange construction, and turbo support to address restrictions found throughout the OEM exhaust manifold.\u003c\/p\u003e\n\u003cp\u003eThe result is a true equal-length header built to maintain consistent exhaust pulse timing, reduce unnecessary restrictions before the turbo, and provide the durability needed to support the factory or stock-location turbo system.\u003c\/p\u003e\n\u003cp\u003eBest of all, this is a true bolt-on upgrade that does not require an ECU tune simply to install it.\u003c\/p\u003e\n\u003ch3\u003eWhy Equal Length Matters on the FA20 WRX\u003c\/h3\u003e\n\u003cp\u003eThe 2015-2021 WRX uses a twin-scroll turbocharger, which works best when exhaust pulses reach the turbine at consistent intervals. Runner length, bend angle, and collector design all play an important role in maintaining that pulse timing.\u003c\/p\u003e\n\u003cp\u003eGrimmSpeed designed all four runners together with the merge collector to closely match both their overall length and bend angles. The finished runners have less than 1% variance between the longest and shortest tubes, with no more than a 5-degree difference between the most and least-bent runners.\u003c\/p\u003e\n\u003cp\u003eThis creates a genuinely equal-length, equal-bend design intended to deliver more consistent exhaust energy to the twin-scroll turbine.\u003c\/p\u003e\n\u003ch3\u003eDesigned to Improve on the Factory Header\u003c\/h3\u003e\n\u003cp\u003eThe factory FA20 exhaust manifold contains multiple areas where the tubing diameter narrows and exhaust flow becomes restricted. The OEM collectors also use shapes and merge angles that prioritize mass production rather than optimal exhaust flow.\u003c\/p\u003e\n\u003cp\u003eGrimmSpeed addressed these areas with consistently sized runners, smoother transitions, and a higher-angle merge collector designed to direct exhaust flow into the turbine without opposing exhaust streams interfering with one another.\u003c\/p\u003e\n\u003cp\u003eThis is the kind of detail that separates a properly engineered header from one that simply looks better than stock.\u003c\/p\u003e\n\u003ch3\u003eTrue Equal-Length Runners\u003c\/h3\u003e\n\u003cp\u003eEach exhaust runner is CNC bent and trimmed from a single piece of tubing. This eliminates unnecessary welded sections that can create internal steps, interrupt exhaust flow, or introduce additional potential failure points.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eLess than 1% total runner-length variance\u003c\/li\u003e\n\u003cli\u003eMaximum 5-degree bend variance between runners\u003c\/li\u003e\n\u003cli\u003eSingle-piece CNC-bent and trimmed runners\u003c\/li\u003e\n\u003cli\u003e14-gauge stainless steel tubing\u003c\/li\u003e\n\u003cli\u003eNo unnecessary runner welds or internal junctions\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eCast Merge Collector\u003c\/h3\u003e\n\u003cp\u003eInstead of fabricating the collector from multiple welded sections, GrimmSpeed uses a single cast 304 stainless steel merge collector.\u003c\/p\u003e\n\u003cp\u003eThe cast design allows the runner spacing and merge angles to be tightly controlled while creating smooth internal transitions into the turbocharger. It also eliminates five additional welded junctions that would otherwise create potential flow interruptions and structural failure points.\u003c\/p\u003e\n\u003cp\u003eThe compact collector design also allows the header to fit between the oil pan and factory skid plate without sacrificing ground clearance.\u003c\/p\u003e\n\u003ch3\u003eBuilt for Strength and Long-Term Durability\u003c\/h3\u003e\n\u003cp\u003eThe turbocharger and exhaust system place significant weight and stress on the FA20 exhaust manifold, so GrimmSpeed designed this header with durability in mind.\u003c\/p\u003e\n\u003cp\u003eThe cylinder-head flanges are CNC cut and faced from 1\/2-inch-thick 304 stainless steel. The additional thickness helps resist distortion during welding and allows the finished flange surfaces to be machined flat for reliable gasket sealing.\u003c\/p\u003e\n\u003cp\u003eThe runners are also welded to the flanges from both the inside and outside. The internal weld area is finished with a rounded transition to provide a smoother path from the cylinder head into each runner.\u003c\/p\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eDesigned for the FA20DIT twin-scroll turbo system\u003c\/li\u003e\n\u003cli\u003eTrue equal-length header design\u003c\/li\u003e\n\u003cli\u003eLess than 1% runner-length variance\u003c\/li\u003e\n\u003cli\u003eMaximum 5-degree runner bend variance\u003c\/li\u003e\n\u003cli\u003eFull 304 stainless steel construction\u003c\/li\u003e\n\u003cli\u003eSingle-piece CNC-bent and trimmed runners\u003c\/li\u003e\n\u003cli\u003e14-gauge stainless steel tubing\u003c\/li\u003e\n\u003cli\u003eLow-restriction cast stainless steel merge collector\u003c\/li\u003e\n\u003cli\u003e1\/2-inch CNC-cut and faced cylinder-head flanges\u003c\/li\u003e\n\u003cli\u003eRunners welded inside and outside of the flanges\u003c\/li\u003e\n\u003cli\u003eSmooth internal exhaust transitions\u003c\/li\u003e\n\u003cli\u003eNo ECU tune required for installation\u003c\/li\u003e\n\u003cli\u003eNo loss of factory ground clearance\u003c\/li\u003e\n\u003cli\u003eClears the factory skid plate without spacers\u003c\/li\u003e\n\u003cli\u003eJ-pipe\/turbo support bracket included\u003c\/li\u003e\n\u003cli\u003eInstallation gaskets and hardware included\u003c\/li\u003e\n\u003cli\u003eManufactured and welded in the USA\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eNo Tune Required\u003c\/h3\u003e\n\u003cp\u003eGrimmSpeed designed this header to be safely installed without requiring an ECU recalibration. You can bolt the header onto a compatible vehicle without needing a tune solely because the header was installed.\u003c\/p\u003e\n\u003cp\u003eA custom calibration may still be beneficial as part of a larger performance build, especially when combining the header with additional airflow, boost, fueling, or exhaust modifications, but a tune is not required for the header itself.\u003c\/p\u003e\n\u003ch3\u003eTurbo Support Matters\u003c\/h3\u003e\n\u003cp\u003eOne detail that is easy to overlook on the FA20 platform is the amount of weight supported by the exhaust manifold. The turbocharger and J-pipe place considerable stress on the header, and eliminating the factory support can increase the load placed on the tubing and welds.\u003c\/p\u003e\n\u003cp\u003eGrimmSpeed includes its adjustable J-pipe\/turbo support bracket with the header so the turbo system remains properly supported after installation. This is an important durability feature that many aftermarket header setups overlook.\u003c\/p\u003e\n\u003ch3\u003eFitment\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e2015-2021 Subaru WRX\u003c\/li\u003e\n\u003cli\u003e2014-2018 Subaru Forester XT\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e50-State Legal\u003c\/h3\u003e\n\u003cp\u003eGrimmSpeed currently lists its 2015-2021 WRX Equal Length Header as approved for legal use in all 50 states, giving street-driven WRX owners an emissions-compliant option for upgrading the factory exhaust manifold.\u003c\/p\u003e\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e(1) GrimmSpeed Equal Length Header\u003c\/li\u003e\n\u003cli\u003eJ-pipe\/turbo support bracket\u003c\/li\u003e\n\u003cli\u003eRequired installation gaskets\u003c\/li\u003e\n\u003cli\u003eRequired installation hardware\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhy Buy Your GrimmSpeed Header From JD Customs USA?\u003c\/h3\u003e\n\u003cp\u003eA header is not a part we believe should be purchased based on a picture and a part number alone. Runner design, turbo compatibility, tuning requirements, supporting hardware, and how the header fits into the rest of the build all matter.\u003c\/p\u003e\n\u003cp\u003eJD Customs USA specializes in performance parts for modified vehicles, and our goal is to give you the technical information you need to make the right decision before ordering. We take the time to understand what makes this GrimmSpeed header different from the factory manifold, what is included, how it interacts with the FA20 twin-scroll system, and what you should consider as the rest of your WRX build evolves.\u003c\/p\u003e\n\u003cp\u003eWhen you purchase your GrimmSpeed Equal Length Header from JD Customs USA, you have a performance-focused shop behind the order. If you have questions about fitment, supporting modifications, installation, or how this header fits into your build, our team is here to help.\u003c\/p\u003e\n\u003ch3\u003eProduct Details\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e GrimmSpeed\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e GRM113008\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrimary Application:\u003c\/strong\u003e 2015-2021 Subaru WRX\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEngine:\u003c\/strong\u003e FA20DIT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeader Design:\u003c\/strong\u003e Equal Length\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e 304 Stainless Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTubing:\u003c\/strong\u003e 14 Gauge\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlange Thickness:\u003c\/strong\u003e 1\/2 Inch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturing:\u003c\/strong\u003e Made and welded in the USA\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"GrimmSpeed","offers":[{"title":"Default Title","offer_id":50990856667388,"sku":"GRMGRM113008","price":979.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1128\/7276\/files\/5f26f6f2e2dcbfddf410eeb7d3b208f3.jpg?v=1787085544","url":"https:\/\/jdcustomsusa.com\/es\/products\/grimmspeed-15-21-subaru-wrx-14-18-forester-equal-length-exhaust-header","provider":"JD Customs U.S.A","version":"1.0","type":"link"}