Holley’s PCM + Tuner Combo Kits bundle a pre-tuned performance PCM with a compatible handheld tuner for the ultimate convenience. This pairing lets you swap in a calibrated PCM while retaining full adjustability via the included tuner. Ideal for GM, Ford, and Chrysler applications, each kit provides dyno-tested gains in horsepower, torque, and efficiency—delivering everything you need for a quick, reliable, and powerful upgrade.