The Rockford Fosgate RFK-HD9813M5 is a complete amplifier installation kit designed specifically for 1998–2013 Harley-Davidson motorcycles using Rockford Fosgate M5-series audio systems. It’s built to simplify adding aftermarket amplifiers while maintaining OEM-style integration and weather-resistant reliability. Key Features Designed for 1998–2013 Harley-Davidson motorcycles Supports Rockford M5 amplifier systems 5-channel amplifier integration Plug-and-play Harley wiring Motorcycle-specific harnesses Weather-resistant connectors Simplified installation process OEM-style electrical integration Designed for saddlebag audio expansion Compatible with Rockford Harley Stage kits Common ApplicationsThe RFK-HD9813M5 is commonly used with: PMX-HD9813 source units Harley Stage 2 systems Harley Stage 3 systems Saddlebag speaker upgrades Fairing speaker upgrades M5-series amplifier installs It’s especially common in: Road Glide builds Street Glide systems Road King audio upgrades