{"product_id":"haltech-nexus-s3-lexus-gs300-lexus-is300-2002-2005-plug-n-play-adapter-harness-kit-ht-651387","title":"Haltech Nexus S3 ECU \u0026 Lexus GS300 | Lexus IS300 2002-2005 Plug 'n' Play Adapter Harness Kit (HT-651387)","description":"\u003cp\u003e\u003cstrong\u003eThe 2005 GS300 3GR-FSE is a capable V6 platform that benefits from proper standalone engine management.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe Lexus GS300 3GR-FSE platform has a strong tuning community, 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\u003eThrottle response that's precise and proportional\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 regardless of temperature\u003c\/li\u003e\n\u003cli\u003eConsistent engine behavior across temperature ranges\u003c\/li\u003e\n\u003cli\u003eA proper tuning foundation for this specific chassis\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eFeatures\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003ePlug-and-play fitment for 2002-2005 Lexus GS300 3GR-FSE, all transmission types\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 vehicle can return to stock at any time. In automatic transmission applications, the factory ECU remains in parallel for transmission control while the Haltech Nexus manages the engine.\u003c\/p\u003e\n\u003ch4\u003eKit Includes\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e1x Boomslang PNP wiring harness for 2002-2005 Lexus GS300 3GR-FSE\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\u003e2002-2005 Lexus GS300 \/ 2002-2005 Lexus IS300, All Transmission Types.\u003c\/p\u003e","brand":"Tuned By Shawn","offers":[{"title":"Default Title","offer_id":43447300063299,"sku":"HT-651387","price":3107.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0064\/7754\/5539\/files\/HT-213301_00BFv2.png?v=1782007150","url":"https:\/\/www.tunedbyshawn.com\/products\/haltech-nexus-s3-lexus-gs300-lexus-is300-2002-2005-plug-n-play-adapter-harness-kit-ht-651387","provider":"Tuned by Shawn","version":"1.0","type":"link"}