Qwickloom FlexFit – Universal Engine Harness for MaxxECU
Qwickloom FlexFit is a universal engine harness designed for engine swaps, race car builds, or anyone needing a fast, simple, and reliable wiring solution for MaxxECU. It comes 90% pre-wired and clearly labeled for an easy, clean, and professional installation.
Key Features:
Compatible with 4–6 cylinder engines
Supports ignition systems like Coil-on-Plug, wasted spark, and distributor
Fully pre-wired with injector connectors pre-installed
Clearly labeled wires for quick and easy identification
Cut to fit: Trim wires to the correct length, crimp the terminals, insert them into the connectors – and you're ready to start
Built for Flexibility:
FlexFit supports both electronic throttle (e-throttle) and traditional TPS with idle control – both options are already included in the harness. It also features pre-wired connectors for:
Water temperature sensor
Intake air temperature sensor
Crankshaft and optional camshaft sensors
Ignition coils
TPS/idle motor or e-throttle
LSU 4.2 wideband lambda (pre-wired)
Boost control
VVT/VOOS
CAN bus
AUX connector with extra inputs and outputs
Ready for Custom Add-ons:
The main section of the harness is left unsealed, allowing you to easily add components like a starter motor, alternator, or other custom features before finalizing the installation. Once done, seal it with the included high-quality, glue-lined heat shrink for maximum durability and weather protection.
ECU Compatibility:
MaxxECU Street, Sport, Race, and Pro.
If you're unsure which MaxxECU version you need, please see this
MAXXECU COMPARISON GUIDE.