Reduce road noise and heat transfer in your GMC C25 with a precision-fit sound deadener kit designed specifically for your vehicle. Each kit is manufactured to match the original floor pan contours, firewall dimensions, and interior layout of your GMC C25—delivering a factory-correct installation and a noticeably quieter cabin.

Our GMC C25 sound deadener kits are available in EVA, Mastic with Pad, and Jute materials depending on the original factory specification for your application. Multi-piece kits provide complete coverage of the passenger area, transmission tunnel, and firewall in a single order. All materials are automotive-grade and engineered for long-term durability, heat resistance, and vibration damping—restoring the insulation performance your vehicle had from the factory.

Use the Vehicle Selector above to find the correct sound deadener kit for your year and model, or browse below to explore available options for your GMC C25. Whether you’re completing a full interior restoration or simply addressing road noise in a daily driver, Factory Interiors makes it easy to achieve a quieter, more comfortable cabin with sound deadener kits proudly made in the USA.