{"product":{"id":11142672777558,"title":"Nostrum BMW N55 \/ S55 3.0L Stage 3 High Flow DI Injectors","body_html":"\u003ch2\u003eSummary\u003c\/h2\u003e\u003cp\u003eStage 3 is the biggest direct injector Nostrum builds for the BMW N55 and S55, and it exists for cars that have already outgrown the Stage 2 set. Each injector flows 1675 cc\/min, or 20.2 g\/s, at 100 bar, which is 85% more than the stock S55 part, and the set is rated to 250 bar of operating pressure. It is a direct-fit design that needs no harness changes and no spacers, arrives as six injectors with OEM decoupling rings already installed, and comes with a full installation guide. This is the fuelling step for a serious ethanol build, not a first upgrade, and the list of cars it covers is deliberately short.\u003c\/p\u003e\u003ch2\u003eBest For\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eHeavily boosted S55 M3, M4 and M2 Competition builds running E85 where Stage 2 injectors are already at their duty limit.\u003c\/li\u003e\n\u003cli\u003eBig single or upgraded twin turbo setups that have moved well past the standard airflow.\u003c\/li\u003e\n\u003cli\u003e435i and F87 M2 non-Competition N55 cars taken to a similar level.\u003c\/li\u003e\n\u003cli\u003eCars where the tuner has asked for injector headroom rather than more pump pressure.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWhere This Sits Above The Stage 2 Set\u003c\/h2\u003e\u003cp\u003eThe jump from 1410 cc\/min to 1675 cc\/min is not a small trim: it is the difference between a strong road map and a build chasing the top of what the S55 fuel system supports. Nostrum quotes 1100 whp on petrol and 960 whp on E85 as the ceiling this injector can support with the whole car built and calibrated to suit, not as something the injector delivers by itself. It is also worth noting that Nostrum lists EcuTek and Bootmod3 for this set, where the \u003ca href=\"\/products\/nostrum-3-0l-bmw-s55-n55-stage-2-di-injectors\"\u003eStage 2 injectors\u003c\/a\u003e add MHD, so confirm your tuning platform first.\u003c\/p\u003e\u003ch2\u003eKey Specs\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eManufacturer: Nostrum High Performance\u003c\/li\u003e\n\u003cli\u003eProduct Type: high flow direct injectors, set of six\u003c\/li\u003e\n\u003cli\u003eSKU: H750-1605\u003c\/li\u003e\n\u003cli\u003eVehicle Application: BMW 3.0L N55 and S55, F-chassis\u003c\/li\u003e\n\u003cli\u003eFlow: 1675 cc\/min and 20.2 g\/s at 100 bar\u003c\/li\u003e\n\u003cli\u003eFlow capacity: 85% over stock\u003c\/li\u003e\n\u003cli\u003eFitment type: direct fit, no harness or spacers needed\u003c\/li\u003e\n\u003cli\u003eIncluded: six injectors with OEM decoupling rings pre-installed, installation guide\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eFitment And Setup Checks\u003c\/h2\u003e\u003cp\u003eThe fitment list below is short, so check it carefully before ordering: outside the M3, M4 and M2, only the 435i and the F87 M2 non-Competition are covered. A calibration on EcuTek or Bootmod3 is required. On an S55 the pumps need to keep up too, so pair these with the twin Standard Bore Plus pump kit, or buy the two together as the \u003ca href=\"\/products\/nostrum-3-0l-bmw-s55-stage-3-bundle\"\u003eS55 Stage 3 bundle\u003c\/a\u003e.\u003c\/p\u003e\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eManufacturer\u003c\/td\u003e\n\u003ctd\u003eNostrum High Performance\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003eHigh flow direct injectors\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSKU\u003c\/td\u003e\n\u003ctd\u003eH750-1605\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVehicle Application\u003c\/td\u003e\n\u003ctd\u003eBMW 3.0L N55 and S55\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSet size\u003c\/td\u003e\n\u003ctd\u003e6 injectors\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVolume flow rate\u003c\/td\u003e\n\u003ctd\u003e1675 cc\/min at 100 bar\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMass flow rate\u003c\/td\u003e\n\u003ctd\u003e20.2 g\/s at 100 bar\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFlow capacity\u003c\/td\u003e\n\u003ctd\u003e85% over stock\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax operating pressure\u003c\/td\u003e\n\u003ctd\u003e250 bar \/ 25 MPa \/ 3625 psi\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSupported potential\u003c\/td\u003e\n\u003ctd\u003e1100 whp petrol, 960 whp E85, calculated at 24 MPa fuel pressure with a full supporting build\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTuning suites\u003c\/td\u003e\n\u003ctd\u003eEcuTek, Bootmod3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003eLimited lifetime against manufacturing defects\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003ch3\u003eVehicle Fitment\u003c\/h3\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eYears\u003c\/th\u003e\n\u003cth\u003eChassis\u003c\/th\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e2015-2018\u003c\/td\u003e\n\u003ctd\u003eF82\/F83\u003c\/td\u003e\n\u003ctd\u003eM4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2015-2018\u003c\/td\u003e\n\u003ctd\u003eF80\u003c\/td\u003e\n\u003ctd\u003eM3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2016-2019\u003c\/td\u003e\n\u003ctd\u003eF87\u003c\/td\u003e\n\u003ctd\u003eM2 Competition\/CS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2016-2018\u003c\/td\u003e\n\u003ctd\u003eF87\u003c\/td\u003e\n\u003ctd\u003eM2 (Non-Competition)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2013-2016\u003c\/td\u003e\n\u003ctd\u003eF32\/F33\/F36\u003c\/td\u003e\n\u003ctd\u003e435i\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\u003ch3\u003eAre these overkill for a Stage 2 car?\u003c\/h3\u003e\u003cp\u003eUsually, yes. A car on a stock or lightly upgraded turbo is better served by the Stage 2 set, which covers a far wider range of BMWs. Stage 3 earns its place once airflow and ethanol content have both climbed.\u003c\/p\u003e\u003ch3\u003eDo they need a different harness or spacers?\u003c\/h3\u003e\u003cp\u003eNo. Nostrum lists them as a direct fit with no harness or spacer requirement, and the OEM decoupling rings are already installed on each injector.\u003c\/p\u003e\u003ch3\u003eWhich tuning software do I need?\u003c\/h3\u003e\u003cp\u003eEcuTek or Bootmod3. A calibration is required either way, so line up the tuner before the parts go on.\u003c\/p\u003e","vendor":"Nostrum High Performance","product_type":"High Flow Direct Injectors","created_at":"2026-07-24T13:02:22+01:00","handle":"nostrum-bmw-n55-s55-stage-3-di-injectors","updated_at":"2026-09-08T16:29:10+01:00","published_at":"2026-07-24T17:57:29+01:00","template_suffix":null,"published_scope":"global","tags":"BMW, BMW 4 Series, BMW 435i, BMW M2, BMW M3, BMW M4, brand:nostrum-high-performance, cat:fuel, dept:performance-parts, fits:bmw-4-series, fits:bmw-m2, fits:bmw-m3, fits:bmw-m4, make:bmw, type:high-flow-direct-injectors","variants":[{"id":54805978743126,"product_id":11142672777558,"title":"Default Title","price":"2109.94","sku":"H750-1605","position":1,"compare_at_price":"","fulfillment_service":"manual","inventory_management":null,"option1":"Default Title","option2":null,"option3":null,"created_at":"2026-07-24T13:02:23+01:00","updated_at":"2026-09-08T16:29:10+01:00","taxable":true,"barcode":null,"grams":0,"image_id":null,"weight":0.0,"weight_unit":"kg","requires_shipping":true,"quantity_rule":{"min":1,"max":null,"increment":1},"price_currency":"GBP","compare_at_price_currency":"","quantity_price_breaks":[]}],"options":[{"id":14231271932246,"product_id":11142672777558,"name":"Title","position":1,"values":["Default Title"]}],"images":[{"id":83087868428630,"product_id":11142672777558,"position":1,"created_at":"2026-07-24T16:01:35+01:00","updated_at":"2026-07-24T16:01:37+01:00","alt":"Nostrum BMW N55-S55 Stage 3 DI Injectors","width":386,"height":386,"src":"https:\/\/cdn.shopify.com\/s\/files\/1\/0952\/1849\/9926\/files\/H750-1709_-_BMW_S55-N55_Stage_3_Direct_Injectors_image_02__61732.1695303256.386.513_efbfbe9c-a1cf-4e23-b781-7af2bed84520.jpg?v=1784905297","variant_ids":[]}],"image":{"id":83087868428630,"product_id":11142672777558,"position":1,"created_at":"2026-07-24T16:01:35+01:00","updated_at":"2026-07-24T16:01:37+01:00","alt":"Nostrum BMW N55-S55 Stage 3 DI Injectors","width":386,"height":386,"src":"https:\/\/cdn.shopify.com\/s\/files\/1\/0952\/1849\/9926\/files\/H750-1709_-_BMW_S55-N55_Stage_3_Direct_Injectors_image_02__61732.1695303256.386.513_efbfbe9c-a1cf-4e23-b781-7af2bed84520.jpg?v=1784905297","variant_ids":[]}}}