Replacement Module Assembly

The MSD Ignition Replacement Module Assembly (ASY14548) is a critical ignition system component designed for performance-focused engine builders and mechanics who demand reliability in high-output applications. This module serves as the control brain for MSD's advanced ignition systems, managing spark timing, dwell control, and engine performance optimization. Whether you're rebuilding a modified street engine, restoring a classic performance car, or maintaining a race-proven ignition platform, this replacement assembly ensures your system continues delivering precise ignition control without compromise.

At just 0.49 lbs and measuring 3.7 x 2.15 x 3.95 inches, this compact module assembly integrates seamlessly into existing MSD ignition systems while maintaining the advanced signal processing these systems are engineered for. The module handles variable dwell timing and multi-stage spark advance curves that adapt to engine load and RPM, crucial features for tuned engines running higher boost levels or aggressive cam profiles. MSD's proven electronics architecture minimizes electrical noise interference and provides stable operation across wide temperature ranges—essential when mounting near headers or in tight engine bays where thermal stress is constant.

This replacement assembly is ideal for mechanics refreshing aging MSD systems, engine builders swapping complete ignition packages, or enthusiasts replacing a failed module without purchasing an entire new ignition kit. The compact form factor allows straightforward mounting in most engine configurations, from carbureted V8s to modern EFI conversions running MSD control systems. Direct compatibility with MSD's full line of distributors, coils, and wiring harnesses ensures drop-in installation with no additional fabrication. Keep a spare on the shelf for critical builds or racing programs where ignition system reliability directly impacts performance consistency.