{"product":{"id":11142672712022,"title":"Nostrum BMW S55 \/ N55 3.0L Stage 2 High Flow DI Injectors","body_html":"\u003ch2\u003eSummary\u003c\/h2\u003e\u003cp\u003eOnce the pump is sorted, the injectors become the next thing standing between an N55 or S55 and a bigger map. Nostrum's Stage 2 direct injectors flow 1410 cc\/min at 100 bar, which is 55% more than the stock S55 injector and 12% more than the EU5 part, and they are rated to 250 bar of operating pressure. They arrive as a tested, flow-matched set of six with OEM decoupling rings already fitted, a serial-numbered data card and a quick-start guide, so the set going into the engine is a known quantity rather than six loose parts. This is the middle step in Nostrum's BMW ladder and covers a wide slice of the N55 range as well as the S55 M cars.\u003c\/p\u003e\u003ch2\u003eBest For\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eN55 and S55 cars that have already fitted an upgraded high pressure pump and are now injector-limited.\u003c\/li\u003e\n\u003cli\u003eEthanol-blend builds, where the extra duty cycle demanded by E85 leaves the stock injector with nothing in reserve.\u003c\/li\u003e\n\u003cli\u003eStage 2 turbo or hybrid turbo setups that need more fuel without jumping to the largest injector Nostrum makes.\u003c\/li\u003e\n\u003cli\u003eOwners who want the set matched and documented before it goes in, rather than mixing part numbers.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eStage 2 Or Stage 3?\u003c\/h2\u003e\u003cp\u003eStage 2 at 1410 cc\/min is the sensible choice for most tuned road cars, and it covers far more of the BMW range: 335i, 435i, M135i, M235i, 535i, 640i, 740i, X3\/X4 35i and X5\/X6 35i are all on the list alongside the M3, M4 and M2 Competition. The \u003ca href=\"\/products\/nostrum-bmw-n55-s55-stage-3-di-injectors\"\u003eStage 3 set\u003c\/a\u003e steps up to 1675 cc\/min but covers a much narrower group of cars. If the build is a heavily boosted, ethanol-fed S55, look at Stage 3. For everything else on this list, Stage 2 is the better match.\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: H703-1257\u003c\/li\u003e\n\u003cli\u003eVehicle Application: BMW 3.0L N55 and S55\u003c\/li\u003e\n\u003cli\u003eFlow: 1410 cc\/min and 17.0 g\/s at 100 bar\u003c\/li\u003e\n\u003cli\u003eFlow capacity: 55% over stock, 12% over EU5\u003c\/li\u003e\n\u003cli\u003eFuel: ethanol compatible\u003c\/li\u003e\n\u003cli\u003eIncluded: flow-matched set of six, install and quick-start guides, data card with serial numbers, OEM decoupling rings pre-installed\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eFitment And Setup Checks\u003c\/h2\u003e\u003cp\u003eCheck your chassis code and year against the fitment table below, since the N55 coverage runs well past the obvious 335i and 435i cars. A calibration on EcuTek, Bootmod3 or MHD is required. If the fuel pump is still standard, fit the \u003ca href=\"\/products\/nostrum-bmw-n55-1170-250-gauntlet-hpfp-kit\"\u003eN55 1170-250 Gauntlet pump\u003c\/a\u003e alongside these, or buy the pair together as a bundle.\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\u003eH703-1257\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVehicle Application\u003c\/td\u003e\n\u003ctd\u003eBMW 3.0L S55 and N55\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\u003e1410 cc\/min at 100 bar (nHeptane)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMass flow rate\u003c\/td\u003e\n\u003ctd\u003e17.0 g\/s at 100 bar (Viscor 16A)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFlow capacity\u003c\/td\u003e\n\u003ctd\u003e55% over stock, 12% over EU5\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\u003e800 whp petrol, 720 whp E85 with a full supporting build and calibration\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTuning suites\u003c\/td\u003e\n\u003ctd\u003eEcuTek, Bootmod3, MHD\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003eLimited lifetime to the original purchaser\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\u003eAll\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\u003eAll\u003c\/td\u003e\n\u003ctd\u003eF80\u003c\/td\u003e\n\u003ctd\u003eM3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAll\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\u003e2013-2015\u003c\/td\u003e\n\u003ctd\u003eF30\/F31\u003c\/td\u003e\n\u003ctd\u003e335i\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\u003ctr\u003e\n\u003ctd\u003e2013-2016\u003c\/td\u003e\n\u003ctd\u003eF22\/F23\u003c\/td\u003e\n\u003ctd\u003eM235i\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2015-2016\u003c\/td\u003e\n\u003ctd\u003eF20\/F21\u003c\/td\u003e\n\u003ctd\u003eM135i LCI\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2012-2015\u003c\/td\u003e\n\u003ctd\u003eF20\/F21\u003c\/td\u003e\n\u003ctd\u003eM135i\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\u003e2013-2017\u003c\/td\u003e\n\u003ctd\u003eF10\/F11\/F07\u003c\/td\u003e\n\u003ctd\u003e535i\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2013-2017\u003c\/td\u003e\n\u003ctd\u003eF25\/F26\u003c\/td\u003e\n\u003ctd\u003eX3\/X4 35i\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2014-2019\u003c\/td\u003e\n\u003ctd\u003eF15\/F16\u003c\/td\u003e\n\u003ctd\u003eX5\/X6 35i\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2013-2018\u003c\/td\u003e\n\u003ctd\u003eF06\/F12\/F13\u003c\/td\u003e\n\u003ctd\u003e640i\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2013-2015\u003c\/td\u003e\n\u003ctd\u003eF01\u003c\/td\u003e\n\u003ctd\u003e740i\/Li\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\u003ch3\u003eWhat does flow matching actually give me?\u003c\/h3\u003e\u003cp\u003eEvery injector in the set is tested and matched, so the six deliver the same amount of fuel as each other. That keeps the fuelling even across cylinders and gives the tuner a stable starting point.\u003c\/p\u003e\u003ch3\u003eDo these fit the N55 as well as the S55?\u003c\/h3\u003e\u003cp\u003eYes. The same set covers both engines, which is why the fitment table runs from the M135i through to the X5 35i as well as the M3 and M4.\u003c\/p\u003e\u003ch3\u003eIs a tune required?\u003c\/h3\u003e\u003cp\u003eYes. Bigger injectors change the fuelling maths completely, so the car needs recalibrating on EcuTek, Bootmod3 or MHD before it is driven.\u003c\/p\u003e","vendor":"Nostrum High Performance","product_type":"High Flow Direct Injectors","created_at":"2026-07-24T13:02:21+01:00","handle":"nostrum-3-0l-bmw-s55-n55-stage-2-di-injectors","updated_at":"2026-09-08T16:29:45+01:00","published_at":"2026-07-24T17:57:27+01:00","template_suffix":null,"published_scope":"global","tags":"BMW, BMW 1 Series, BMW 2 Series, BMW 3 Series, BMW 335i, BMW 4 Series, BMW 435i, BMW 5 Series, BMW 535i, BMW 6 Series, BMW 640i, BMW 7 Series, BMW 740i, BMW M135i, BMW M2, BMW M235i, BMW M3, BMW M4, BMW X3, BMW X4, BMW X5, BMW X6, brand:nostrum-high-performance, cat:fuel, dept:performance-parts, fits:bmw-1-series, fits:bmw-2-series, fits:bmw-3-series, fits:bmw-4-series, fits:bmw-5-series, fits:bmw-6-series, fits:bmw-7-series, fits:bmw-m2, fits:bmw-m3, fits:bmw-m4, fits:bmw-x3, fits:bmw-x4, fits:bmw-x5, fits:bmw-x6, make:bmw, type:high-flow-direct-injectors","variants":[{"id":54805978677590,"product_id":11142672712022,"title":"Default Title","price":"1741.20","sku":"H703-1257","position":1,"compare_at_price":"","fulfillment_service":"manual","inventory_management":null,"option1":"Default Title","option2":null,"option3":null,"created_at":"2026-07-24T13:02:21+01:00","updated_at":"2026-09-08T16:29:45+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":14231271801174,"product_id":11142672712022,"name":"Title","position":1,"values":["Default Title"]}],"images":[{"id":83087868395862,"product_id":11142672712022,"position":1,"created_at":"2026-07-24T16:01:35+01:00","updated_at":"2026-07-24T16:01:37+01:00","alt":"Nostrum 3.0L BMW S55-N55 Stage 2 DI Injectors","width":386,"height":386,"src":"https:\/\/cdn.shopify.com\/s\/files\/1\/0952\/1849\/9926\/files\/Bmw_stage_2_DI_injector_bigcommerce_image__56773__40695.1695307435.386.513_1cb3393c-aa71-4e46-ba70-4e805efd1396.png?v=1784905297","variant_ids":[]}],"image":{"id":83087868395862,"product_id":11142672712022,"position":1,"created_at":"2026-07-24T16:01:35+01:00","updated_at":"2026-07-24T16:01:37+01:00","alt":"Nostrum 3.0L BMW S55-N55 Stage 2 DI Injectors","width":386,"height":386,"src":"https:\/\/cdn.shopify.com\/s\/files\/1\/0952\/1849\/9926\/files\/Bmw_stage_2_DI_injector_bigcommerce_image__56773__40695.1695307435.386.513_1cb3393c-aa71-4e46-ba70-4e805efd1396.png?v=1784905297","variant_ids":[]}}}