MSD 5525 Street Fire GM HEI Internal Distributor Ignition Coil, Black

The MSD 5525 Street Fire Ignition Coil is a high-performance internal replacement coil designed as a direct bolt-in upgrade for GM High Energy Ignition (HEI) distributors. It mounts directly in place of the factory coil and accepts OEM connectors for a straightforward, no-hassle installation.

Engineered by MSD's performance team, this in-cap coil delivers up to 40,000 volts of output — a meaningful improvement over stock coils. The performance gains come from carefully selected materials and optimized winding ratios that reduce primary resistance and increase spark energy output for stronger, more consistent combustion.

Key Features:

• Direct Bolt-In Replacement — Mounts in place of factory GM HEI internal coil; accepts OEM connectors
• 40,000V Maximum Output — Increased spark energy over stock for improved combustion
• Low Primary Resistance — 0.310 ohms for efficient energy transfer
• Secondary Resistance: 9.2K ohms
• Epoxy-Filled Construction — In-cap coil style with durable internal build
• Male/HEI Coil Wire Attachment — Compatible with standard HEI tower connections
• Black Finish — Clean, professional appearance
• Sold Individually

The MSD 5525 is a smart performance upgrade for any GM vehicle running an HEI distributor, delivering reliable ignition performance with improved voltage output and a simple plug-and-play installation. No mounting bracket or coil wire included.