{"product_id":"iag-550-2-5l-subaru-short-block-for-wrx-sti-legacy-gt-forester-xt-550-bhp","title":"IAG 550 2.5L Subaru Short Block for WRX, STI, Legacy GT, Forester XT - 550 BHP","description":"\u003ch2 style=\"text-align:center;\"\u003eIAG 550 EJ25 2.5L SUBARU SHORT BLOCK\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\/gzqim5R6EUo?start=0\u0026amp;end=0\u0026amp;autoplay=1\u0026amp;loop=1\u0026amp;mute=1\u0026amp;playlist=gzqim5R6EUo\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 2.5L Subaru Case Half Set for WRX, STI, Legacy GT, Forester XT\" loading=\"lazy\" src=\"https:\/\/i.shgcdn.com\/33e99668-b13d-437f-a25f-80ec99e19b8f\/-\/format\/auto\/-\/preview\/3000x3000\/-\/quality\/lighter\/\" style=\"display:block;margin:0 auto;\"\u003e\n\u003ch2 style=\"text-align:center;\"\u003eBUILT FOR BOOST\u003c\/h2\u003e\n\u003cdiv class=\"product-text\"\u003e\u003cp\u003eDesigned for modified EJ25 Subarus, the IAG 550 Short Block is a sturdy upgrade that is capable of handling higher cylinder pressures created by increased boost levels. The OEM Subaru connecting rods and pistons (yes, even the STI RA) aren’t strong enough to take on the additional engine load of a larger turbocharger or an increase in boost pressure, which can quickly lead to costly engine failure. Built for boost, IAG’s 550 Short Block solves this problem by incorporating the use of high performance internal components that can stand up to extra load on the motor, ensuring longevity and reliability in high-performance scenarios.\u003c\/p\u003e\u003c\/div\u003e\n\u003cimg alt=\"IAG 550 2.5L Subaru Short Block Connecting Rods for WRX, STI, Legacy GT, Forester XT\" loading=\"lazy\" src=\"https:\/\/i.shgcdn.com\/e4d9d8ef-eb58-4c8a-ba3a-108d8c0f573b\/-\/format\/auto\/-\/preview\/3000x3000\/-\/quality\/lighter\/\" style=\"display:block;margin:0 auto;\"\u003e\n\u003ch2 style=\"text-align:center;\"\u003eIAG SPEC H-BEAM FORGED CONNECTING RODS\u003c\/h2\u003e\n\u003cdiv class=\"product-text\"\u003e\u003cp\u003eThe IAG 550 Short Block features IAG Spec H-Beam forged connecting rods with ARP2000 rod bolts, along with ACL or King race rod bearings. These structurally optimized connecting rods provide solid support to your high powered EJ25 Subaru engine. Capable of withstanding higher RPM conditions, the ACL and King race rod bearings are a perfect match for this resilient and capable short block. \u003c\/p\u003e\u003c\/div\u003e\n\u003cimg alt=\"IAG 550 2.5L Subaru Short Block Forged Pistons for WRX, STI, Legacy GT, Forester XT\" loading=\"lazy\" src=\"https:\/\/i.shgcdn.com\/80d9c91d-0b41-4242-a739-2950226da5b1\/-\/format\/auto\/-\/preview\/3000x3000\/-\/quality\/lighter\/\" style=\"display:block;margin:0 auto;\"\u003e\n\u003ch2 style=\"text-align:center;\"\u003eIAG SPEC JE FORGED PISTONS\u003c\/h2\u003e\n\u003cdiv class=\"product-text\"\u003e\u003cp\u003eTo create this high strength short block, IAG teamed up with JE Pistons to create a high performing piston strong enough to match up to the capabilities of the 550 Short Block. With over seventy years of experience in manufacturing ready-to-race forged pistons, JE Pistons has been an invaluable partner in the development of the IAG Spec JE 99.75mm Forged Pistons installed in the IAG 550 Short Block.\u003cbr\u003e\u003cbr\u003eThese 2618 T6 Alloy high-strength pistons have been specifically designed to support increased cylinder pressures which come with more boost. This is accomplished by using an asymmetrical skirt design instead of the traditional full-round skirt, which also significantly reduces piston weight. Another design attribute of the IAG Spec JE Forged Pistons is the smooth flowing radii on the domes and dishes, which promotes superior flame travel. The pistons are securely fastened to the rods with .905 x 2.250\" x .180\" wall carbon steel wrist pins combined with Tru Arc locks.\u003c\/p\u003e\u003c\/div\u003e\n\u003cimg alt=\"Comparison of Type RA and IAC-Spec JE Forged Pistons.\" loading=\"lazy\" src=\"https:\/\/i.shgcdn.com\/d8a84ae3-8f44-48d6-bd97-5ba238de6905\/-\/format\/auto\/-\/quality\/normal\/\" style=\"display:block;margin:0 auto;\"\u003e\n\u003ch2 style=\"text-align:center;\"\u003eWHY UPGRADE?\u003c\/h2\u003e\n\u003cdiv class=\"product-text\"\u003e\u003cp\u003eThe most common failure point of the OEM Subaru STI EJ257 short blocks are the piston ringlands. The metal ledges on the pistons that hold the compression rings in place can stand up to regular usage, but are susceptible to failure when used in conjunction with modifications. Cracked or broken ringlands often result in increased oil consumption and eventual bearing failure if the oil level is not closely monitored. While Subaru’s RA block has slightly stronger pistons than the STI EJ257, they are still prone to the same type of failure caused by damaged ringlands.\u003c\/p\u003e\u003c\/div\u003e\n\u003cimg alt=\"IAG 550 2.5L Subaru Short Block for WRX, STI, Legacy GT, Forester XT\" loading=\"lazy\" src=\"https:\/\/i.shgcdn.com\/2a3088aa-3f0f-4f22-a25a-65dee3837b27\/-\/format\/auto\/-\/preview\/3000x3000\/-\/quality\/lighter\/\" style=\"display:block;margin:0 auto;\"\u003e\n\u003ch2 style=\"text-align:center;\"\u003eSUPERIOR DESIGN\u003c\/h2\u003e\n\u003cdiv class=\"product-text\"\u003e\u003cp\u003eThe pistons in the OEM Subaru STI EJ257 and the RA blocks continue to be produced using a hypereutectic cast design. This casting method is susceptible to irregularities in both the casting process and the materials used, leading to potential weaknesses in the pistons. This is where the IAG Spec JE Piston comes in; forged from a durable 2618 T6 Alloy with a unique silicone additive, these JE pistons effectively absorb the direct shock and impact of combustion. Engineered to withstand ringland damage due to detonation and preignition, they feature a higher strength material and have been custom designed to feature thicker ringlands.\u003c\/p\u003e\u003c\/div\u003e\n\u003cimg alt=\"IAG 550 2.5L Subaru Short Block Crankshaft for WRX, STI, Legacy GT, Forester XT\" loading=\"lazy\" src=\"https:\/\/i.shgcdn.com\/f6ce92ed-b715-40ba-8ddf-7cad5327add7\/-\/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\u003cp\u003eEach IAG 550 Short Block starts with a brand-new EJ25 Subaru 2.5L case providing a solid foundation for its upgraded components. The case halves are bored and honed to 99.75mm, then measured and assembled using a new 2017+ Subaru 2.5L nitride-treated STI crankshaft, which is matched to ACL or King race main bearings. The IAG 550 Short Block also features IAG Spec H-Beam Connecting Rods with ARP2000 rod bolts, along with ACL or King race rod bearings. The case halves are sealed with new OEM main case bolts and sealant. Finally, a set of IAG Spec JE 99.75mm Forged Pistons are carefully selected, measured, and installed to finish off the short block.\u003c\/p\u003e\u003c\/div\u003e\n\u003cimg alt=\"Professionally Assembled Short Block\" loading=\"lazy\" src=\"https:\/\/i.shgcdn.com\/76dc05b6-5dc3-46d8-a835-0a9e6d037434\/-\/format\/auto\/-\/quality\/normal\/\" style=\"display:block;margin:0 auto;\"\u003e\n\u003ch2 style=\"text-align:center;\"\u003ePROFESSIONALLY ASSEMBLED AND READY TO INSTALL\u003c\/h2\u003e\n\u003cdiv class=\"product-text\"\u003e\u003cp\u003eOur team of certified Subaru specialists at IAG Performance takes great care in assembling each IAG 550 Short Block. These specialists have now built over 16,000 Subaru engines and counting. Equipped with an advanced selection of tooling and state-of-the-art equipment, we guarantee the quality of all our engine blocks. Each block is meticulously crafted and thoroughly checked, ensuring the highest standards of quality assurance. IAG’s assembled Short Blocks make it easy to upgrade your EJ25 Subaru engine, just leave the technical work to us, and we’ll provide you with a superior short block that’s ready to install. \u003c\/p\u003e\u003c\/div\u003e\n\u003cimg alt=\"\" loading=\"lazy\" src=\"https:\/\/i.shgcdn.com\/cd4d2b1c-e805-43e9-9f9e-49900fce912e\/-\/format\/auto\/-\/quality\/normal\/\" style=\"display:block;margin:0 auto;\"\u003e\n\u003ch2 style=\"text-align:center;\"\u003eWE’VE GOT YOU COVERED\u003c\/h2\u003e\n\u003cdiv class=\"product-text\"\u003e\u003cp\u003eWhile a new OEM block from Subaru doesn't come with a warranty when installed in a different vehicle, IAG Performance supports your purchase with a 12-month or 12,000-mile workmanship warranty for the IAG 550 Short Block. We take that even further to a 24-month, 24,000-mile workmanship warranty when purchased, installed, and tuned at one of our Certified Engine Installation facilities around the country. At IAG Performance, we are committed to your satisfaction and the lasting quality of our products. Our goal is to deliver a superior product that will last you for miles to come.\u003c\/p\u003e\u003c\/div\u003e\n\u003ch2 style=\"text-align:center;\"\u003eNEED HELP CHOOSING A BLOCK?\u003c\/h2\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\/AMytJ0EHOZo?start=0\u0026amp;end=0\u0026amp;autoplay=0\u0026amp;loop=0\u0026amp;rel=1\" allowfullscreen loading=\"lazy\" style=\"position:absolute;top:0;left:0;width:100%;height:100%;border:0;\"\u003e\u003c\/iframe\u003e\u003c\/div\u003e\n\u003cdiv class=\"product-text\"\u003e\u003cp\u003eWe made this video to highlight the differences between each of our short blocks and to help you choose the best one for your performance goals and budget. Our Build Advisors and Customer Support staff can also assist you with any questions or concerns. Just click the button below for assistance.\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 Short Block has a power output rating of 550 BHP\u003c\/p\u003e\u003c\/div\u003e\n\u003ch2 style=\"text-align:center;\"\u003eHARDWARE \/ SEAL OPTION\u003c\/h2\u003e\n\u003cdiv class=\"product-text\"\u003e\u003cp\u003eNot planning on reusing your original short block service plugs and covers? IAG offers a simple comprehensive cover and seal kit that includes (1) Rear main seal, (3) OEM wrist pin plugs, (3) OEM wrist pin plug washers, (1) OEM separator cover, (6) OEM separator cover bolts, (1) OEM wrist pin service cover, (1) OEM wrist pin service cover O-ring and (2) OEM wrist pin service cover screws. *If you are reusing your original wrist pin service plugs and covers always replace the (3) OEM wrist pin plug washers and (1) wrist pin service cover O-ring before installing a short block to avoid potential leaks. *Never reuse a rear main seal on a new short block.\u003c\/p\u003e\u003c\/div\u003e\n\u003ch2 style=\"text-align:center;\"\u003eOIL PICKUP \/ OIL BAFFLE \/ WINDAGE TRAY OPTIONS\u003c\/h2\u003e\n\u003cdiv class=\"product-text\"\u003e\u003cp\u003eThe IAG Performance Subaru WRX \/ STI oil pickup was designed by Tigwerks to replace the OEM EJ25 oil pickup, which is prone to failure. It's a well-known fact that the OEM oil pickups often crack and fail which, in most cases, destroys your engine from lack of oil pressure. To avoid the cracking failures seen in the OEM oil pickup tubes, the Tigwerks oil pickup is manufactured from heavy-gauge steel tubing that is 3x thicker than OEM. Additionally, it features a flange machined from 3\/8\" 1018 CR steel to mate with the block, sealed with a Viton O-ring. The integrated heavy-duty mounting bracket uses two mounting points rather than the OEM single mounting point. Furthermore, the oil pickup features a formed bottom with an OEM style mesh screen for proper filtration. The TIG-welded oil pickup's increased material thickness, matched with the two-point heavy-duty mounting bracket, helps ensure that it does not fatigue and fail over time like an OEM unit.The IAG Oil Control Baffle and Windage Tray System is designed to limit potential blow-by and prevent oil starvation in your Subaru's WRX \/ STI EJ engine during high rpm and high g-force driving. Through the use of Viton one-way flapper valves on our baffle and louvers in our windage tray, oil is prevented from reentering the upper crankcase area and is directed down into the oil pan to ensure plentiful supply to the oil pickup. IAG's integrated two-piece Oil Control Baffle and Windage Tray System is designed to work with our own oil pickup, as well as other oil pickups*. The baffle fits neatly in the engine crankcase area, allowing normal installation of the OEM oil pan and popular aftermarket pans*.Oil Pickup \u0026amp; Baffle Install Notes\u003c\/p\u003e\u003c\/div\u003e\n\u003ch2 style=\"text-align:center;\"\u003eOIL PUMP OPTION\u003c\/h2\u003e\n\u003cdiv class=\"product-text\"\u003e\n\u003cp\u003eThe 11mm Subaru Oil pump is one of the most popular off the shelf pumps to use on EJ25 engines. Originally equipped on the 2008-21 STI Dual AVCS engines, it provides an adequate amount of pressure and flow that fits the needs of many OE and built engines. But, as with almost anything, there is room for improvement.\u003c\/p\u003e\n\u003cp\u003eIncreasing oil flow volume and pressure in an EJ25 ensures that the bearings have sufficient oil film under all power levels and driving conditions. Additional oil flow to the engine provides a greater oil reserve to operate the AVCS solenoids and cam gears - giving you more consistent performance results.\u003c\/p\u003e\n\u003cp\u003eThe IAG Stage 2 CNC Ported 11mm oil pump was developed over years of servicing street and racing engines. In that time IAG has tested and utilized the majority of the popular Subaru oil pumps available on the market (JDM, Cosworth, ACL etc.) for customer, personal and racing vehicles.\u003c\/p\u003e\n\u003cp\u003eOver the last few years if you wanted an upgraded oil pump over the stock 11mm you would either buy a hand ported model from a trusted source, or often an OEM JDM (Japanese Market) 12mm pump. We believe that we have developed a better alternative. The IAG Stage 2 CNC Ported 11mm oil pumps have shown through lab testing on a Spintron Machine that it will outperform a JDM 12mm.\u003c\/p\u003e\n\u003cp\u003eThe Stage 2 Oil pump is a cost effective solution that outperforms the market standards. This pump has been extensively tested on street cars, track cars, and on our in-house Spintron to ensure consistent and repeatable performance.\u003c\/p\u003e\n\u003cp\u003eEach IAG Stage 2 oil pump starts life as an OEM spec 11mm oil pump, straight from Subaru. IAG completely disassembles the new oil pump including pulling the rotors, backing plate \u0026amp; pressure relief valve. Next, the main body is fixtured in our in-house 5-Axis Centroid CNC machine where the inlet and outlet passageways are CNC ported. This allows for a larger, more consistent pathway for the oil into and out of the gerotor internals and helps to prevent cavitation. The Oil Pump Outlet where it meets the engine block is also CNC “Port Matched”, for a perfect transition into the engine block. The Inlet and Outlet sides of the gerotor are also opened up on the CNC mill to reduce inlet side cavitation, and to reduce outlet side pressure drops.\u003c\/p\u003e\n\u003cp\u003eThe pressure relief valve piston is REM Polished, which provides a non-directional, low Ra, polished finish. This reduces friction, heat and possibility of the relief valve piston galling and sticking, a common failure point on the OEM pumps.\u003c\/p\u003e\n\u003cp\u003eThe piston is reinstalled and confirmed to operate correctly. The rotors are measured and checked to be within the manufacturer's specification - aka Blueprinted, and installed next. The pump is then put together with a light coating of assembly lube to reduce friction and scuffing and aid in priming on first start up.\u003c\/p\u003e\n\u003cp\u003eFinally, the backing plate is installed. Loctite is added to the hardware, and each piece receives a painted mark after it is correctly torqued. The pump ships ready to install, with all hardware and seals required for installation.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"IAG Performance","offers":[{"title":"Default Title","offer_id":48066713682138,"sku":"IAG-ENG-S550","price":4499.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0828\/8623\/0234\/files\/api13uxz3__40268.1633558626.1280.1280__66374.1678223271.1280.1280.jpg?v=1781533637","url":"https:\/\/www.iagperformance.com\/products\/iag-550-2-5l-subaru-short-block-for-wrx-sti-legacy-gt-forester-xt-550-bhp","provider":"IAG Performance","version":"1.0","type":"link"}