Haltech Nexus S2 ECU & Toyota Celica GT 2000-2005 Plug 'n' Play Adapter Harness Kit (HT-651027)

The Celica GT 1ZZ-FE is a solid naturally aspirated platform that benefits from precise calibration more than most people give it credit for.

The Toyota Celica GT 1ZZ-FE is a high-revving driver-focused platform, and standalone ECU support opens what the factory management keeps locked down. The Tuned By Shawn PNP Wiring Harness Kit for the Haltech Nexus connects directly to your factory harness without any permanent modifications, giving the Haltech Nexus full standalone engine control. No cutting, no splicing, fully reversible.

Advantages

• Throttle response that's immediate and consistent from idle through the rev range
• Fuel and ignition timing calibrated to your actual modifications, not Toyota's conservative baseline
• Idle stability that's locked in across temperature ranges
• A tune built to support whatever modifications you're running
• Engine behavior that matches the intent of the car rather than working around it

Features

• Plug-and-play fitment for 2000-2005 Toyota Celica GT 1ZZ-FE, manual transmission
• Compatible with Haltech Nexus R3, R5, S2, and S3 ECUs
• No cutting or splicing of factory wiring
• OEM-quality connectors, USA-built by Boomslang Fabrication
• Fully reversible, factory harness preserved
• For competition and off-road use

The Details

Built 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.

Kit Includes

• 1x Boomslang PNP wiring harness for 2000-2005 Toyota Celica GT 1ZZ-FE
• Haltech Nexus S2 ECU
• Air Temp Sensor - Small Thread Thread: M14 x 1.5

Fitment

2000-2005 Toyota Celica GT, Manual Transmission.