{"product_id":"haltech-nexus-s2-toyota-celica-gt-s-2003-2005-plug-n-play-adapter-harness-kit-ht-651023","title":"Haltech Nexus S2 ECU \u0026 Toyota Celica GT-S 2003-2005 Plug 'n' Play Adapter Harness Kit (HT-651023)","description":"\u003cp\u003e\u003cstrong\u003eThe final GT-S 2ZZ-GE is one of the best naturally aspirated engines Toyota built for the road, and a proper standalone tune shows exactly why.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe Toyota Celica GT-S 2ZZ-GE is a high-revving driver-focused platform, and standalone ECU support opens what the factory management keeps locked down. The \u003cstrong\u003eTuned By Shawn PNP Wiring Harness Kit for the Haltech Nexus\u003c\/strong\u003e connects directly to your factory harness without any permanent modifications, giving the Haltech Nexus full standalone engine control. No cutting, no splicing, fully reversible.\u003c\/p\u003e\n\u003ch4\u003eAdvantages\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eSharp throttle response tuned precisely to your setup\u003c\/li\u003e\n\u003cli\u003eFuel and ignition timing calibrated to your actual modifications, not Toyota's conservative baseline\u003c\/li\u003e\n\u003cli\u003eIdle stability that's locked in across temperature ranges\u003c\/li\u003e\n\u003cli\u003eA tune built to support whatever modifications you're running\u003c\/li\u003e\n\u003cli\u003eEngine behavior that matches the intent of the car rather than working around it\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eFeatures\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003ePlug-and-play fitment for 2003-2005 Toyota Celica GT-S 2ZZ-GE, manual transmission\u003c\/li\u003e\n\u003cli\u003eCompatible with Haltech Nexus R3, R5, S2, and S3 ECUs\u003c\/li\u003e\n\u003cli\u003eNo cutting or splicing of factory wiring\u003c\/li\u003e\n\u003cli\u003eOEM-quality connectors, USA-built by Boomslang Fabrication\u003c\/li\u003e\n\u003cli\u003eFully reversible, factory harness preserved\u003c\/li\u003e\n\u003cli\u003eFor competition and off-road use\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eThe Details\u003c\/h4\u003e\n\u003cp\u003eBuilt specifically for this vehicle's connector layout with OEM-spec connectors and correct wire gauge throughout. Your factory harness stays completely untouched and the car can return to stock at any time. The Haltech Nexus takes full engine control once installed, giving your tuner a clean vehicle-specific foundation to build a proper map from.\u003c\/p\u003e\n\u003ch4\u003eKit Includes\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e1x Boomslang PNP wiring harness for 2003-2005 Toyota Celica GT-S 2ZZ-GE\u003c\/li\u003e\n\u003cli\u003eHaltech Nexus ECU sold separately\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eFitment\u003c\/h4\u003e\n\u003cp\u003e2003-2005 Toyota Celica GT-S, Manual Transmission.\u003c\/p\u003e","brand":"Tuned By Shawn","offers":[{"title":"Default Title","offer_id":43447230464067,"sku":"HT-651023","price":2707.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0064\/7754\/5539\/files\/nexus_S2.webp?v=1782228020","url":"https:\/\/www.tunedbyshawn.com\/products\/haltech-nexus-s2-toyota-celica-gt-s-2003-2005-plug-n-play-adapter-harness-kit-ht-651023","provider":"Tuned by Shawn","version":"1.0","type":"link"}