{"product_id":"iag-550-street-cylinder-heads-package-for-02-14-wrx-04-21-sti-05-09-lgt-04-13-fxt","title":"IAG 550 Street Cylinder Heads Package for 02-14 WRX, 04-21 STI, 05-09 LGT, 04-13 FXT","description":"\u003ch2 style=\"text-align:center;\"\u003eIAG 550 STREET CYLINDER HEADS PACKAGE FOR 02-14 WRX, 04-21 STI, 05-09 LGT, 04-13 FXT\u003c\/h2\u003e\n\u003chr style=\"border:none;border-top:1px solid #e0e0e0;margin:24px 0;\"\u003e\n\u003cdiv class=\"video-embed\" style=\"position:relative;width:100%;padding-bottom:56.25%;height:0;overflow:hidden;\"\u003e\u003ciframe src=\"https:\/\/www.youtube.com\/embed\/305emc5e9vQ?start=0\u0026amp;end=0\u0026amp;autoplay=1\u0026amp;loop=1\u0026amp;mute=1\u0026amp;playlist=305emc5e9vQ\u0026amp;version=3\u0026amp;rel=0\" allowfullscreen loading=\"lazy\" style=\"position:absolute;top:0;left:0;width:100%;height:100%;border:0;\"\u003e\u003c\/iframe\u003e\u003c\/div\u003e\n\u003chr style=\"border:none;border-top:1px solid #e0e0e0;margin:24px 0;\"\u003e\n\u003cimg alt=\"IAG 550 Subaru Cylinder Heads\" loading=\"lazy\" src=\"https:\/\/i.shgcdn.com\/8d1dd02d-9ba9-40ed-8b47-1fd33d15bf7a\/-\/format\/auto\/-\/preview\/3000x3000\/-\/quality\/lighter\/\" style=\"display:block;margin:0 auto;\"\u003e\n\u003ch2 style=\"text-align:center;\"\u003eENTRY-LEVEL STOCK REPLACEMENT HEADS\u003c\/h2\u003e\n\u003cdiv class=\"product-text\"\u003e\u003cp\u003eThe IAG 550 Cylinder Heads are designed to function as an entry-level replacement for stock OEM heads. If your engine has suffered a catastrophic failure which requires replacement of your cylinder heads, or if you don't have OEM heads to start with, the IAG 550 Cylinder Heads are a perfect solution. These heads also work great for cars with basic bolt-on parts up to 550 BHP. These heads include upgraded GSC standard size valves, GSC Viton Valve Stem Seals, IAG Stage 1 Valve Springs with Titanium Retainers, and OEM Keepers. GSC S1 Camshafts are available with OEM valve lifter buckets. We also offer an optional chamber modification service (see below) for EJ20 heads to allow use on EJ25 short blocks.\u003c\/p\u003e\u003c\/div\u003e\n\u003cimg alt=\"Newen Seat and Guide Machine Machining IAG Cylinder Heads\" loading=\"lazy\" src=\"https:\/\/i.shgcdn.com\/ab285357-5f46-41b2-9201-89f35697bdd1\/-\/format\/auto\/-\/preview\/3000x3000\/-\/quality\/lighter\/\" style=\"display:block;margin:0 auto;\"\u003e\n\u003ch2 style=\"text-align:center;\"\u003eBUILT WITH 100% NEW COMPONENTS\u003c\/h2\u003e\n\u003cdiv class=\"product-text\"\u003e\n\u003cp\u003eEach IAG 550 Cylinder Head Set starts with new OEM castings from Subaru of America. The first step is to select your Year and Model of vehicle so that we may provide you with the right castings to fit your project. Next, you'll select whether or not you want to include our optional GSC camshaft package. If selected, these heads will include new GSC S1 Camshafts and OEM Lifter Buckets for valve adjustment.\u003c\/p\u003e \u003cp\u003eThe bare castings are visually inspected and then fixtured into our in-house Centroid 5-axis CNC Machine. In the Centroid, the heads undergo a cam clearance machining process which removes material from the lifter area where larger lift and duration cam profiles are known to contact the castings. (Just in case you want to go bigger later.) Then the heads are fixtured in our Newen Valve Guide and Seat Machine to cut all intake and exhaust seats with a multi-angle valve job that suits the flow characteristics of GSC's standard size 36mm Intake and 32mm Exhaust valves. At this point, the heads' decks are resurfaced using our TS-3000 BlockMate, which cuts the aluminum to a smooth, even finish. Next, the heads are ultrasonically cleaned to remove debris and oils from the machining process. Finally, the heads are reassembled using GSC Stainless Intake and Exhaust Valves, GSC Viton stem seals, IAG-Stage 1 Valve Springs with Titanium Retainers, and OEM Valve Keepers.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cimg alt=\"GSC Stage 1 Cams \u0026amp; OEM Lifter Buckets\" loading=\"lazy\" src=\"https:\/\/i.shgcdn.com\/5bc2130c-994d-41c5-af13-59d9e35d39f5\/-\/format\/auto\/-\/preview\/3000x3000\/-\/quality\/lighter\/\" style=\"display:block;margin:0 auto;\"\u003e\n\u003ch2 style=\"text-align:center;\"\u003eOPTIONAL GSC S1 CAMSHAFT AND LIFTER BUCKET PACKAGE\u003c\/h2\u003e\n\u003cdiv class=\"product-text\"\u003e\u003cp\u003eIf you're planning for more power you'll want to select these GSC Power-Division billet S1 camshafts for your IAG 550 Head Package. These will not drop any low end power, and will create more power and torque across the entire RPM range. These are perfect for stock frame upgraded turbos or up to 500 WHP upgrades. Along with the camshafts we'll include all new OEM valve lifter buckets and set bench lash using our specially designed fixture. (FINAL LASH SHOULD BE CHECKED AND ADJUSTED ONCE HEADS ARE INSTALLED)\u003c\/p\u003e\u003c\/div\u003e\n\u003cimg alt=\"IAG Combustion Chamber Modification for Subaru S20 Heads\" loading=\"lazy\" src=\"https:\/\/i.shgcdn.com\/8be5f0bf-f7f2-4743-854c-8d27fb1032ca\/-\/format\/auto\/-\/preview\/3000x3000\/-\/quality\/lighter\/\" style=\"display:block;margin:0 auto;\"\u003e\n\u003ch2 style=\"text-align:center;\"\u003eWHAT IS \"CHAMBER MODIFICATION\" \u0026amp; DO I NEED IT?\u003c\/h2\u003e\n\u003cdiv class=\"product-text\"\u003e\u003cp\u003eIAG's optional Chamber Modification Service is designed to reshape the combustion chamber of your cylinder heads to closely match the chamber of USDM STI cylinder heads to allow for use with 2.5L short blocks. This service is exclusive to USDM EJ20 2002-2005 WRX Cylinder Heads. IF YOU ARE NOT USING USDM HEADS ON A 2.5L EJ25 BLOCK, YOU DO NOT NEED THIS SERVICE.\u003c\/p\u003e\u003c\/div\u003e\n\u003cimg alt=\"CEI\" loading=\"lazy\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0828\/8623\/0234\/files\/Unknown-378.png\" style=\"display:block;margin:0 auto;\"\u003e\n\u003ch2 style=\"text-align:center;\"\u003eQUALITY GUARANTEED\u003c\/h2\u003e\n\u003cdiv class=\"product-text\"\u003e\u003cp\u003eWe stand behind every hand-built engine we produce. IAG's Standard Short Block Workmanship Warranty covers your short block for 12 months or 12,000 miles. We have also teamed up with a selection of IAG Certified Installation Facilities which offer up to a 24 month\/24,000 mile workmanship warranty when the engine is purchased, installed, and tuned by that IAG Certified Installer.\u003c\/p\u003e\u003c\/div\u003e\n\u003ch2 style=\"text-align:center;\"\u003ePOWER RATING\u003c\/h2\u003e\n\u003cdiv class=\"product-text\"\u003e\u003cp\u003ePower:The IAG 550 Cylinder Head Package has a power output rating of 550 BHP\u003c\/p\u003e\u003c\/div\u003e","brand":"IAG Performance","offers":[{"title":"02-05 WRX - S20 Heads (PN#IAG-ENG-H550SE) \/ Yes, Include GSC S1 Camshafts \u0026 Lifters \/ Yes","offer_id":48059166589146,"sku":"IAG-ENG-H550SCL","price":5399.99,"currency_code":"USD","in_stock":true},{"title":"02-05 WRX - S20 Heads (PN#IAG-ENG-H550SE) \/ Yes, Include GSC S1 Camshafts \u0026 Lifters \/ No","offer_id":48059166621914,"sku":"IAG-ENG-H550SL","price":5149.99,"currency_code":"USD","in_stock":true},{"title":"02-05 WRX - S20 Heads (PN#IAG-ENG-H550SE) \/ No, I Don't Need Cams \u0026 Lifters \/ Yes","offer_id":48059166654682,"sku":"IAG-ENG-H550SCE","price":3599.99,"currency_code":"USD","in_stock":true},{"title":"02-05 WRX - S20 Heads (PN#IAG-ENG-H550SE) \/ No, I Don't Need Cams \u0026 Lifters \/ No","offer_id":48059166687450,"sku":"IAG-ENG-H550SE","price":3399.99,"currency_code":"USD","in_stock":true},{"title":"06-14 WRX, 06-13 FXT,  07-09 LGT - D25 Heads (PN# IAG-ENG-H550DE) \/ Yes, Include GSC S1 Camshafts \u0026 Lifters \/ Yes","offer_id":48059166720218,"sku":"IAG-ENG-H550DNONE","price":4899.99,"currency_code":"USD","in_stock":true},{"title":"06-14 WRX, 06-13 FXT,  07-09 LGT - D25 Heads (PN# IAG-ENG-H550DE) \/ Yes, Include GSC S1 Camshafts \u0026 Lifters \/ No","offer_id":48059166752986,"sku":"IAG-ENG-H550DL","price":5149.99,"currency_code":"USD","in_stock":true},{"title":"06-14 WRX, 06-13 FXT,  07-09 LGT - D25 Heads (PN# IAG-ENG-H550DE) \/ No, I Don't Need Cams \u0026 Lifters \/ Yes","offer_id":48059166785754,"sku":"IAG-ENG-H550DNONE2","price":3199.99,"currency_code":"USD","in_stock":true},{"title":"06-14 WRX, 06-13 FXT,  07-09 LGT - D25 Heads (PN# IAG-ENG-H550DE) \/ No, I Don't Need Cams \u0026 Lifters \/ No","offer_id":48059166818522,"sku":"IAG-ENG-H550DE","price":3399.99,"currency_code":"USD","in_stock":true},{"title":"04-07 STI, 04-05 FXT, 05-09 LGT V25 Heads (PN# IAG-ENG-H550VE) \/ Yes, Include GSC S1 Camshafts \u0026 Lifters \/ Yes","offer_id":48059166851290,"sku":"IAG-ENG-H550VNONE","price":4899.99,"currency_code":"USD","in_stock":true},{"title":"04-07 STI, 04-05 FXT, 05-09 LGT V25 Heads (PN# IAG-ENG-H550VE) \/ Yes, Include GSC S1 Camshafts \u0026 Lifters \/ No","offer_id":48059166884058,"sku":"IAG-ENG-H550VL","price":5149.99,"currency_code":"USD","in_stock":true},{"title":"04-07 STI, 04-05 FXT, 05-09 LGT V25 Heads (PN# IAG-ENG-H550VE) \/ No, I Don't Need Cams \u0026 Lifters \/ Yes","offer_id":48059166916826,"sku":"IAG-ENG-H550VNONE2","price":3199.99,"currency_code":"USD","in_stock":true},{"title":"04-07 STI, 04-05 FXT, 05-09 LGT V25 Heads (PN# IAG-ENG-H550VE) \/ No, I Don't Need Cams \u0026 Lifters \/ No","offer_id":48059166949594,"sku":"IAG-ENG-H550VE","price":3399.99,"currency_code":"USD","in_stock":true},{"title":"18-19 STI Type RA, 2019-21 STI N25 Heads (PN# IAG-ENG-H550NE) \/ Yes, Include GSC S1 Camshafts \u0026 Lifters \/ Yes","offer_id":48059166982362,"sku":"IAG-ENG-H550NNONE","price":4899.99,"currency_code":"USD","in_stock":true},{"title":"18-19 STI Type RA, 2019-21 STI N25 Heads (PN# IAG-ENG-H550NE) \/ Yes, Include GSC S1 Camshafts \u0026 Lifters \/ No","offer_id":48059167015130,"sku":"IAG-ENG-H550NL","price":5149.99,"currency_code":"USD","in_stock":true},{"title":"18-19 STI Type RA, 2019-21 STI N25 Heads (PN# IAG-ENG-H550NE) \/ No, I Don't Need Cams \u0026 Lifters \/ Yes","offer_id":48059167047898,"sku":"IAG-ENG-H550NONE2","price":3199.99,"currency_code":"USD","in_stock":true},{"title":"18-19 STI Type RA, 2019-21 STI N25 Heads (PN# IAG-ENG-H550NE) \/ No, I Don't Need Cams \u0026 Lifters \/ No","offer_id":48059167080666,"sku":"IAG-ENG-H550NE","price":3399.99,"currency_code":"USD","in_stock":true},{"title":"08-18 STI W25 Heads (PN# IAG-ENG-H550WE) \/ Yes, Include GSC S1 Camshafts \u0026 Lifters \/ Yes","offer_id":48059167113434,"sku":"IAG-ENG-H550WNONE","price":4899.99,"currency_code":"USD","in_stock":true},{"title":"08-18 STI W25 Heads (PN# IAG-ENG-H550WE) \/ Yes, Include GSC S1 Camshafts \u0026 Lifters \/ No","offer_id":48059167146202,"sku":"IAG-ENG-H550WL","price":5149.99,"currency_code":"USD","in_stock":true},{"title":"08-18 STI W25 Heads (PN# IAG-ENG-H550WE) \/ No, I Don't Need Cams \u0026 Lifters \/ Yes","offer_id":48059167178970,"sku":"IAG-ENG-H550WNONE2","price":3199.99,"currency_code":"USD","in_stock":true},{"title":"08-18 STI W25 Heads (PN# IAG-ENG-H550WE) \/ No, I Don't Need Cams \u0026 Lifters \/ No","offer_id":48059167211738,"sku":"IAG-ENG-H550WE","price":3399.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0828\/8623\/0234\/files\/IAG-ENG-H550SCL-01__32651.1678380550.1280.1280.jpg?v=1781530390","url":"https:\/\/www.iagperformance.com\/products\/iag-550-street-cylinder-heads-package-for-02-14-wrx-04-21-sti-05-09-lgt-04-13-fxt","provider":"IAG Performance","version":"1.0","type":"link"}