Rywire RY-K-SUB-EF-88-91-SI K-Series Chassis Adapter Harness for 88-91 Civic/CRX Si/HF/EX

The Rywire RY-K-SUB-EF-88-91-SI is a chassis-specific adapter harness designed to enable K-Series engine swaps into 1988-1991 Honda Civic and CRX Si, HF, and EX models. This adapter harness connects your K-Series engine harness to the factory chassis interior harness while integrating the E-plug and all its essential functions.

Key Features:

• Compatible with 02-04 K20 engine harnesses and all Rywire K-Series engine harnesses (K1 and K2 types)
• Connects K-Series engine harness to factory chassis interior harness
• Integrates E-plug functionality for complete engine management
• Designed for use with K-Pro or re-flashed ECU systems
• Can be used with stock RSX ECU when immobilizer is properly bypassed
• Manufactured in the USA with quality construction

This chassis-specific adapter eliminates the need to replace your entire chassis harness during a K-swap. The design preserves your factory interior wiring while providing seamless integration with K-Series engine management systems. Installation may require pulling shock tower plugs into the interior for optimal fitment and drilling a small hole in the exhaust tunnel for the O2 sensor connection.