I don't think the AUS are knockoffs. They are remanned I believe. Concept Z sells them but you can also get them from advance auto or direct from AUS in Tempe AZ. [ http://www.ausinjector.com/550-cc-min-52-lbs-hr-811/ ] https://conceptzperformance.com/aus-injection-injectors-set-late-style-w-optional-early-to-late-adapter-kit-550cc-nissan-300zx-z32-10188-550-6_p_14981.php https://shop.advanceautoparts.com/p/aus-injection-fuel-injector-set-10188-550-6-0/11533804-P?searchTerm=AUS+injector I didn't notice the used nismos until now but still more expensive than the AUS.
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