{"product_id":"isr-performance-top-feed-injectors-1000cc-set-of-4","title":"ISR Performance - Top Feed Injectors - 1000cc- (set of 4)","description":"\u003cp\u003eOur 1000cc top-feed injectors, sold as a balanced set of four. The matched injector for our ISR top-feed fuel rail and intake manifold combo on SR and 4-cylinder applications, and a universal drop-in for any compatible top-feed setup.\u003c\/p\u003e\u003ch3\u003eWhat It Does\u003c\/h3\u003e\u003cp\u003eDelivers 1000cc of flow per injector for serious power builds. Every set is flow-matched within 2% variation across the transitional, low, and linear pulse-width ranges, so all four cylinders fire consistent fuel even at low duty cycle and idle. Stainless steel internals make these E85-compatible. High-impedance design works with most aftermarket ECUs without needing a resistor box. USCAR connector style is the modern standard for aftermarket pigtails.\u003c\/p\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eUniversal top-feed application. Designed to match our ISR top-feed fuel rail and intake manifold combo on SR-based builds, and fits any setup that accepts the specifications below.\u003c\/p\u003e\u003ch3\u003eImportant Note on Connectors\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eThese injectors use the USCAR connector type and do NOT include pigtails or connectors.\u003c\/strong\u003e Plan to source pigtails separately if your existing harness uses a different connector type (factory Nissan side-feed harnesses do).\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eFlow rate: 1000cc\u003c\/li\u003e\n\u003cli\u003eE85 compatible\u003c\/li\u003e\n\u003cli\u003eHigh impedance\u003c\/li\u003e\n\u003cli\u003e48mm height\u003c\/li\u003e\n\u003cli\u003e14mm upper O-ring\u003c\/li\u003e\n\u003cli\u003e14mm lower O-ring\u003c\/li\u003e\n\u003cli\u003eUSCAR connector type\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eWhat's in the Box\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e4x 1000cc top-feed injectors\u003c\/li\u003e\n\u003cli\u003eInjector O-rings\u003c\/li\u003e\n\u003cli\u003eInjector flow data sheet\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eProduct Details\u003c\/h3\u003e\u003cp style=\"margin-bottom: 4px;\"\u003e\u003cstrong\u003eBrand:\u003c\/strong\u003e ISR Performance\u003c\/p\u003e\u003cp style=\"margin-bottom: 4px;\"\u003e\u003cstrong\u003ePart Number:\u003c\/strong\u003e IS-INJK48441004\u003c\/p\u003e\u003cp style=\"margin-bottom: 4px;\"\u003e\u003cstrong\u003eType:\u003c\/strong\u003e Top-Feed Injectors\u003c\/p\u003e\u003cp style=\"margin-bottom: 4px;\"\u003e\u003cstrong\u003eFlow Rate:\u003c\/strong\u003e 1000cc\u003c\/p\u003e\u003cp style=\"margin-bottom: 4px;\"\u003e\u003cstrong\u003eConnector:\u003c\/strong\u003e USCAR (pigtails NOT included)\u003c\/p\u003e\u003cp style=\"margin-bottom: 4px;\"\u003e\u003cstrong\u003eImpedance:\u003c\/strong\u003e High\u003c\/p\u003e\u003cp style=\"margin-bottom: 4px;\"\u003e\u003cstrong\u003eHeight:\u003c\/strong\u003e 48mm\u003c\/p\u003e\u003cp style=\"margin-bottom: 4px;\"\u003e\u003cstrong\u003eO-Rings:\u003c\/strong\u003e 14mm upper, 14mm lower\u003c\/p\u003e\u003cp style=\"margin-bottom: 4px;\"\u003e\u003cstrong\u003eInternals:\u003c\/strong\u003e Stainless steel (E85 compatible)\u003c\/p\u003e\u003cp style=\"margin-bottom: 4px;\"\u003e\u003cstrong\u003eFlow Variation:\u003c\/strong\u003e Within 2% across transitional, low, and linear pulse-width ranges\u003c\/p\u003e\u003cp style=\"margin-bottom: 4px;\"\u003e\u003cstrong\u003eApplication:\u003c\/strong\u003e ISR top-feed fuel rail \/ intake manifold combo (SR-based builds); universal drop-in for any compatible top-feed setup\u003c\/p\u003e\u003cp style=\"margin-bottom: 4px;\"\u003e\u003cstrong\u003eSold:\u003c\/strong\u003e Balanced set of 4 (with O-rings and flow data sheet)\u003c\/p\u003e\u003cp style=\"margin-bottom: 4px;\"\u003e\u003cstrong\u003eRelated:\u003c\/strong\u003e IS-INJS-550-4 \/ IS-INJS-550-6 (side-feed alternatives if you're not converting to top-feed)\u003c\/p\u003e\u003cp style=\"margin-bottom: 4px;\"\u003e\u003cstrong\u003eLegality:\u003c\/strong\u003e Off-road and competition use only\u003c\/p\u003e","brand":"ISR Performance","offers":[{"title":"Default Title","offer_id":45957118525637,"sku":"IS-INJK48441004","price":422.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0767\/2718\/9701\/files\/injbox__78814.1536856409.500.659.jpg?v=1773346841","url":"https:\/\/www.isrcompetition.com\/products\/isr-performance-top-feed-injectors-1000cc-set-of-4","provider":"ISR Competition","version":"1.0","type":"link"}