Rugged & Reliable K&R Performance Engineering Xtreme-Duty Complete Wiring Kits

The K&R Performance Engineering Xtreme-Duty Complete Wiring Kit is a top-tier, heavy-duty race car wiring harness system engineered for simplicity, durability, and total electrical control. Designed for high-performance environments, this kit delivers a fully integrated switch panel and fuse/relay setup with pre-labeled, color-coded wiring that dramatically reduces installation time and minimizes clutter under the dash. Perfect for performance builders and chassis shops, the Xtreme-Duty kit is known as one of the most rugged and comprehensive harness systems available at its price point — ideal for drag racing, off-road, or custom high-performance builds.

Kits feature all required wires (fuel pump, fan, starter, tach, lights, delay box, 2-step, water temp, and more) in durable GXL insulation, terminals, heat shrink, wire ties, and a poster-sized wiring diagram to ensure a professional, clean installation. It even includes heavy-duty main power and alternator fuses. Multiple accessory circuits such as Prime fuel pump and dual Aux outputs, along with convenience terminals for gauges, lights, grounds and more — plus white LED indicators that illuminate with interior power.