The Haltech Elite 2500 Terminated Harness Kit is designed for GM GEN III LS1 and LS6 engines, offering a fully programmable, drive-by-wire-ready solution for high-performance builds and EFI conversions. With support for GEN IV DBW throttle bodies, this system delivers race-level control, advanced tuning, and seamless integration using Haltech’s Elite 2500 ECU and terminated engine harness.

Built for manual transmission vehicles, this kit is ideal for users requiring a fast, clean installation with maximum flexibility for power management and tuning precision.

Note: For sanctioned off-road and competition use only (NOT CARB LEGAL). Ignition coils and harnesses not included.

Key Features

• Direct Fitment for GM GEN III LS1/LS6 Engines:

  • Supports retrofit of GEN IV LS2/LS3 DBW throttle bodies

  • Pre-wired for OEM 7-pin coil harness connectors

  • Compatible with common Delco/Bosch GM alternator plug

  • Manual transmission applications only

• Elite 2500 ECU Functionality:

  • Drive-by-wire throttle support

  • Closed-loop dual bank O2, flex fuel tuning

  • Dual knock control and per-cylinder corrections

  • Variable camshaft control and staged injection

• Race-Ready Features:

  • Anti-lag, rolling launch, flat shift, trans brake, traction and launch control

  • 4D closed-loop boost control with learning and multiple logic axes

  • Optional advanced torque management for drag racing

• Data Logging & Expansion:

  • Onboard and laptop-based logging

  • Dual CAN bus support for dashes and expansion devices

  • WBC1/2 CAN O2 wideband controller ready (controller not included)

Vehicle Applications

• Engine Compatibility: GM GEN III LS1 and LS6

• Throttle Compatibility: Retrofit-ready for GEN IV LS2/LS3 DBW throttle bodies

• Transmission Requirement: Manual only

Kit Contents

• Haltech Elite 2500 ECU with DBW and race functionality

• Terminated engine harness with integrated fuse block and firewall grommet

• USB programming cable

Note:

• Alternator adapter may be required (HT-040090 or HT-040091)

• Ignition coils and harnesses not included — recommend 8 × HT-020102 and/or HT-045657