MRC Racing Components K Series Chassis Adapter Race Relay Fuse Box Lead Harness K20 K24

Simplify your K-swap race wiring with a purpose-built adapter harness. The MRC Racing Components K-Series Chassis Adapter Race Relay Fuse Box Lead Harness is designed for race cars running engine-only wiring setups. This harness allows you to quickly run an MRC K-Swap Engine Harness or OEM 02-04 RSX/EP3 engine harness in virtually any chassis, providing the relay and fuse box connections your engine needs without the complexity of a full factory chassis harness.

Race Relay Fuse Box Harness Features

• Race-Focused Design — Built for engine-only wiring setups where a full chassis harness is not needed
• Universal Chassis Compatibility — Works in virtually any chassis with a K-series swap
• Plug-and-Play — Connects directly to MRC K-Swap Engine Harness or OEM RSX/EP3 engine harness
• Integrated Relay and Fuse Box — All critical engine electrical connections in one harness
• Simplifies Wiring — Eliminates the need to splice into or adapt a factory chassis harness

Fitment / Applications

• K20 engine swaps (race builds)
• K24 engine swaps (race builds)
• Any chassis running a K-series engine-only wiring setup
• Compatible with MRC K-Swap Engine Harness and OEM 02-04 RSX/EP3 engine harnesses

Notes

• Designed for race cars and stripped builds — not intended for full-feature street car wiring
• Engine harness sold separately

Pro Tip: If you are building a dedicated race car with a K-swap, the biggest wiring headache is usually bridging the engine harness to a stripped-down chassis. This adapter harness solves that problem by giving you everything the engine needs — relays, fuses, and leads — in a single, clean harness that does not require a factory chassis loom.