{"product_id":"ams-ej25-intake-manifold-reverse-rotation-red-2002-2014-wrx-2004-2021-04-08-fxt-copy","title":"AMS EJ25 Intake Manifold - Reverse Rotation - RED - 2002-2014 WRX, 2004-2021, 04-08 FXT","description":"\u003cp class=\"\" data-start=\"0\" data-end=\"480\"\u003e\u003cstrong\u003eIntroducing the AMS Performance Subaru EJ Intake Manifold — a no-compromise solution for serious power and the highest horsepower-producing manifold in its class. Designed and tested in-house using SolidWorks® and CFD analysis software, this cast manifold features a massive 4.5-liter plenum, 13” equal-length runners, and 2.5” tapered ports for maximum airflow and efficiency. CNC-machined billet bellhorns act as internal velocity stacks, delivering a broad powerband and impressive top-end performance. In dyno testing, we saw gains of up to 51 WHP over the OEM manifold. Available in standard or reversed configurations, it supports throttle bodies up to 70mm (with mild porting) and is compatible with top-feed injectors and aftermarket rails. As the most cost-effective intake manifold solution at this power level, it’s the perfect choice for racers and enthusiasts looking to get the most out of their EJ engine.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cdiv\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ch6\u003eGains as high as 51 WHP seen in back to back dyno testing compared to OEM\u003c\/h6\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ch6\u003e4.5 Liter Plenum Volume for Massive Top End Power\u003c\/h6\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ch6\u003e13” Equal Length Intake Runners for a Perfectly Optimized Powerband\u003c\/h6\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ch6\u003eMassive Airflow Supplied to the Engine via 2.5” (63.5mm) ID Intake Runners\u003c\/h6\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ch6\u003eCNC Machined Billet Aluminum Bellhorns to act as Internal Velocity Stacks\u003c\/h6\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ch6\u003eIncreased Port Size at Cylinder Heads Allow Matching to Larger Hand Ported or CNC Ported Cylinder Heads\u003c\/h6\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ch6\u003eThrottle Body Opening Accepts Larger Throttle Bodies up to 2.625” (66.675mm) or 70mm with mild porting\u003c\/h6\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ch6\u003eAvailable with STI Red Powder Coating or Uncoated Configuration in either Standard or Reverse Throttle Body Orientation\u003c\/h6\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv class=\"slick-slider-wrapper\"\u003e\n\u003cdiv class=\"slick-slider slick-slider--size-full slick-initialized slick-dotted\" id=\"slick-slider-1\" data-slick='{\"prevArrow\":\"\u0026lt;button type=\\\"button\\\" class=\\\"slick-prev slick-arrow\\\"\u0026gt;\u0026lt;\\\/button\u0026gt;\",\"nextArrow\":\"\u0026lt;button type=\\\"button\\\" class=\\\"slick-next slick-arrow\\\"\u0026gt;\u0026lt;\\\/button\u0026gt;\",\"autoplay\":true,\"dots\":true,\"fade\":true}'\u003e\n\u003cdiv class=\"slick-list draggable\"\u003e\n\u003cdiv class=\"slick-track\"\u003e\n\u003cdiv class=\"slide slick-slide\" data-attachment-id=\"125487\" data-slick-index=\"0\" aria-hidden=\"true\" role=\"tabpanel\" id=\"slick-slide00\" aria-describedby=\"slick-slide-control00\" tabindex=\"-1\"\u003e\u003c\/div\u003e\n\u003cdiv class=\"slide slick-slide slick-current slick-active\" data-attachment-id=\"125488\" data-slick-index=\"1\" aria-hidden=\"false\" role=\"tabpanel\" id=\"slick-slide01\" aria-describedby=\"slick-slide-control01\" tabindex=\"0\"\u003e\u003c\/div\u003e\n\u003cdiv class=\"slide slick-slide\" data-attachment-id=\"125485\" data-slick-index=\"2\" aria-hidden=\"true\" role=\"tabpanel\" id=\"slick-slide02\" aria-describedby=\"slick-slide-control02\" tabindex=\"-1\"\u003e\u003c\/div\u003e\n\u003cdiv class=\"slide slick-slide\" data-attachment-id=\"125482\" data-slick-index=\"3\" aria-hidden=\"true\" role=\"tabpanel\" id=\"slick-slide03\" aria-describedby=\"slick-slide-control03\" tabindex=\"-1\"\u003e\u003c\/div\u003e\n\u003cdiv class=\"slide slick-slide\" data-attachment-id=\"125486\" data-slick-index=\"4\" aria-hidden=\"true\" role=\"tabpanel\" id=\"slick-slide04\" aria-describedby=\"slick-slide-control04\" tabindex=\"-1\"\u003e\u003c\/div\u003e\n\u003cdiv class=\"slide slick-slide\" data-attachment-id=\"125484\" data-slick-index=\"5\" aria-hidden=\"true\" role=\"tabpanel\" id=\"slick-slide05\" aria-describedby=\"slick-slide-control05\" tabindex=\"-1\"\u003e\u003c\/div\u003e\n\u003cdiv class=\"slide slick-slide\" data-attachment-id=\"125481\" data-slick-index=\"6\" aria-hidden=\"true\" role=\"tabpanel\" id=\"slick-slide06\" aria-describedby=\"slick-slide-control06\" tabindex=\"-1\"\u003e\u003c\/div\u003e\n\u003cdiv class=\"slide slick-slide\" data-attachment-id=\"125479\" data-slick-index=\"7\" aria-hidden=\"true\" role=\"tabpanel\" id=\"slick-slide07\" aria-describedby=\"slick-slide-control07\" tabindex=\"-1\"\u003e\u003c\/div\u003e\n\u003cdiv class=\"slide slick-slide\" data-attachment-id=\"125483\" data-slick-index=\"8\" aria-hidden=\"true\" role=\"tabpanel\" id=\"slick-slide08\" aria-describedby=\"slick-slide-control08\" tabindex=\"-1\"\u003e\u003c\/div\u003e\n\u003cdiv class=\"slide slick-slide\" data-attachment-id=\"125480\" data-slick-index=\"9\" aria-hidden=\"true\" role=\"tabpanel\" id=\"slick-slide09\" aria-describedby=\"slick-slide-control09\" tabindex=\"-1\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003eEngineered To Be The Best\u003c\/h3\u003e\n\u003cdiv\u003eThe AMS Performance Subaru EJ Intake Manifold was engineered from the ground up to be the highest performing solution on the market, leveraging our decades of experience and in-house development capabilities. By casting the manifold, we achieved greater strength and the freedom to sculpt optimized internal geometry for maximum efficiency and airflow. Designed using SolidWorks® and Computational Fluid Dynamics software, it features a massive 4.5-liter plenum for extreme top-end power, 2.5” (63.5mm) intake runner ID, and 3.8” (96.7mm) OD CNC-machined billet aluminum bellhorns that act as internal velocity stacks, and 13” equal-length, tapered runners precisely angled to match cylinder head ports. This combination minimizes turbulence into the combustion chamber, enhances throttle response, and delivers exceptional airflow and horsepower throughout the RPM range — making it the ultimate intake manifold upgrade for Subaru EJ engines.\u003c\/div\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003eUnmatched power gains and excellent response\u003c\/h3\u003e\n\u003cp\u003eTo validate the performance gains of the AMS Subaru EJ Intake Manifold, we conducted extensive back-to-back dyno testing across multiple vehicle setups. Each test was designed to isolate the manifold’s impact by comparing identical configurations with and without the AMS manifold installed. The results were clear: significant increases in power and throttle response across the board. On a 2007 STI equipped with an AMS Rotated Kit, PTE 6266, GSC S2 cams, ported heads, and Supertech +1mm valves running 93 octane, power jumped from 470 WHP to 521 WHP—a massive 51 WHP gain. Even on a more modest builds, like another 2007 STI setup with a GT30R turbo on pump gas saw power rise from 396 WHP to 410 WHP. Similarly, a 2008 STI with a PTE 5858 turbo gained 10 WHP, increasing from 398 to 408 WHP. These results confirm what we engineered this manifold to do: deliver broad, usable power gains throughout the RPM range. Whether you’re chasing lower lap times or faster quarter miles, the AMS EJ Intake Manifold gives you the boost in performance to pull ahead—where it matters most.\u003c\/p\u003e\n\u003cdiv id=\"gallery-2\" class=\"gallery galleryid-51178 gallery-columns-3 gallery-size-full\"\u003e\n\u003cfigure class=\"gallery-item\"\u003e\u003c\/figure\u003e\n\u003cfigure class=\"gallery-item\"\u003e\u003c\/figure\u003e\n\u003cbr\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eApplications\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e02-05 Subaru WRX w\/ EJ20 (Requires adapter to use WRX style drive by cable throttle body)\u003c\/li\u003e\n\u003cli\u003e06-07 Subaru WRX w\/ EJ25\u003c\/li\u003e\n\u003cli\u003e08-14 Subaru WRX w\/ EJ25 (Requires using STI style drive by wire throttle body)\u003c\/li\u003e\n\u003cli\u003e04-07 Subaru STI w\/ EJ25\u003c\/li\u003e\n\u003cli\u003e08-21 Subaru STI w\/ EJ25 (May require mild clearancing of A\/C compressor line)\u003c\/li\u003e\n\u003cli\u003eWill fit various Legacy and Forester EJ25 applications with proper throttle body usage and custom fitting\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eProduct Notes\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eGeneral Manifold Fitment Information\u003c\/strong\u003e\n\u003cul\u003e\n\u003cli\u003eNot compatible with top mount intercoolers.\u003c\/li\u003e\n\u003cli\u003eNot directly compatible with mounting the factory upper coolant reservoir. Custom bracketry will need to be fabricated to mount.\u003c\/li\u003e\n\u003cli\u003e2008+ STI may require mild clearancing of A\/C compressor line\u003c\/li\u003e\n\u003cli\u003eDue to the large variety of rotated turbo kits on the market, we cannot guarantee fitment with every brand. Depending on the turbo location and sizing, interference with the cylinder 3 intake runner is possible.\u003c\/li\u003e\n\u003cli\u003eSome port matching may be required when used in conjunction with CNC or hand ported cylinder heads.\u003c\/li\u003e\n\u003cli\u003eThe bottom of the center plenum features four 1\/8″ and one 1\/4″ NPT ports for vacuum accessories.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThrottle Body and Intercooler Piping Information\u003c\/strong\u003e\n\u003cul\u003e\n\u003cli\u003eStandard configuration intercooler piping will need mild custom fabrication due to placement of throttle body.\u003c\/li\u003e\n\u003cli\u003eThe intake manifold is flanged for 04+ STI drive by wire throttle bodies, but cable throttle bodies can be used with custom fitting and flange adapter.\u003c\/li\u003e\n\u003cli\u003eLarger throttle bodies can be used with proper modifications (Up to 70mm with minor porting) (Larger throttle bodies may also require adapter flanges)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReverse Orientation (Forward Facing Throttle Body) Information \u003c\/strong\u003e\n\u003cul\u003e\n\u003cli\u003eThe intake manifold is available with a standard or optional reverse throttle body orientation, allowing for shorter and more direct intercooler pipe routing. at the front of the engine bay.\u003c\/li\u003e\n\u003cli\u003eReversed configuration requires the relocation of the alternator and removal of the A\/C compressor. Installation is not a direct bolt on and will require custom intercooler piping.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFuel Rail Fitment Information\u003c\/strong\u003e\n\u003cul\u003e\n\u003cli\u003eNot compatible with side feed to top feed conversion rails due to different sidefeed rail mounting points (AMS manifold uses top feed rail mounting points)\u003c\/li\u003e\n\u003cli\u003eRequires aftermarket rails and lines, will not fit with stock fuel rails and lines\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInjector Fitment Information\u003c\/strong\u003e\n\u003cul\u003e\n\u003cli\u003e We recommend the use of Injector Dynamics brand injectors, and cannot guarantee fitment of other manufacturer’s injectors. The AMS intake manifold is designed to use standard Injector Dynamics Bosch-style top feed injectors (part number ####.48.11.WRX.4). These Injector Dynamics injectors come with a lower cap preinstalled (WRX-16B) that must be removed before installation to allow for proper seating into the intake manifold injector port. (48mm body length, Rail side: 11mm bore red adapter, Manifold side: 14mm bore size )\u003c\/li\u003e\n\u003cli\u003eThe manifold is designed for top feed injectors and top feed fuel rails only. Side feed injectors, or conversion kits, will not fit.\u003c\/li\u003e\n\u003cli\u003eOEM Subaru top feed injectors (including modified OEM injectors) will not fit and cannot be used.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv id=\"gallery-3\" class=\"gallery galleryid-51178 gallery-columns-2 gallery-size-full\"\u003e\n\u003cfigure class=\"gallery-item\"\u003e\u003cbr\u003e\n\u003cfigcaption class=\"wp-caption-text gallery-caption\" id=\"gallery-3-125419\"\u003eDesigned for Bosch-style top feed injectors, with bottom cap removed\u003c\/figcaption\u003e\n\u003c\/figure\u003e\n\u003cfigure class=\"gallery-item\"\u003e\u003cbr\u003e\n\u003cfigcaption class=\"wp-caption-text gallery-caption\" id=\"gallery-3-125421\"\u003eWill not fit sidefeed or OEM-style top feed injectors\u003c\/figcaption\u003e\n\u003c\/figure\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"AMS","offers":[{"title":"Default Title","offer_id":43600256106566,"sku":null,"price":1983.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0250\/5929\/5280\/files\/subaru_intake_manifold-4-1-1024x.webp?v=1753365871","url":"https:\/\/subiesupplyco.ca\/products\/ams-ej25-intake-manifold-reverse-rotation-red-2002-2014-wrx-2004-2021-04-08-fxt-copy","provider":"SUBIE SUPPLY CO.","version":"1.0","type":"link"}