{"product_id":"isr-performance-side-feed-injectors-nissan-550cc-set-of-4","title":"ISR Performance - Side Feed Injectors - Nissan 550cc (set of 4)","description":"\u003cp\u003eOur 550cc side-feed injectors for Nissan 4-cylinder applications, sold as a balanced set of four. The right size for the SR20DET and KA24DE crowd that's done with leaking, inconsistent factory injectors but isn't ready to commit to a full top-feed conversion.\u003c\/p\u003e\u003ch3\u003eWhat It Does\u003c\/h3\u003e\u003cp\u003eReplaces your aging factory side-feed injectors with a balanced set sized for moderate power gains over stock. Every set is flow-matched within 2% variation across the transitional, low, and linear pulse-width ranges, so all four cylinders deliver consistent fuel. Stainless steel internals make these E85-compatible.\u003c\/p\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eFits Nissan 4-cylinder engines that use side-feed injectors. Primary applications: SR20DET and KA24DE (and KA24DE turbo conversions). Verify your factory injector style (side-feed vs top-feed) before ordering, particularly on later SR20DET variants.\u003c\/p\u003e\u003ch3\u003eFlow Rate Selection\u003c\/h3\u003e\u003cp\u003e550cc is the right size for moderately upgraded builds (typically up to roughly 300+ horsepower depending on fuel pressure, ECU tune, and fuel type). For higher-power builds, consider a top-feed conversion with our IS-INJK48441004 1000cc top-feed set.\u003c\/p\u003e\u003ch3\u003eWhat's in the Box\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e4x 550cc side-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-INJS-550-4\u003c\/p\u003e\u003cp style=\"margin-bottom: 4px;\"\u003e\u003cstrong\u003eType:\u003c\/strong\u003e Side-Feed Injectors\u003c\/p\u003e\u003cp style=\"margin-bottom: 4px;\"\u003e\u003cstrong\u003eFlow Rate:\u003c\/strong\u003e 550cc\u003c\/p\u003e\u003cp style=\"margin-bottom: 4px;\"\u003e\u003cstrong\u003eApplication:\u003c\/strong\u003e Nissan 4-cylinder side-feed (SR20DET, KA24DE, and similar)\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\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-550-6 (550cc 6-cyl variant for RB applications); IS-INJK48441004 (1000cc top-feed for top-feed conversion builds)\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":45957118558405,"sku":"IS-INJS-550-4","price":462.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0767\/2718\/9701\/files\/injboxside__55473.1536857058.500.659.jpg?v=1773346841","url":"https:\/\/www.isrcompetition.com\/products\/isr-performance-side-feed-injectors-nissan-550cc-set-of-4","provider":"ISR Competition","version":"1.0","type":"link"}