Holley PCM Swap Kits make upgrading your factory powertrain controller fast and frustration-free. Designed for direct-fit installation, these kits include pre-tuned PCMs, harnesses, and supporting hardware where required. Perfect for engine swaps or ECU replacements, each kit ensures proper communication, calibration, and performance from the start—providing a reliable path to modern tuning capability for your late-model or swap project vehicle.