Get GMC C3500HD Headers And Exhaust Systems. Find GMC C3500HD Exhaust Manifolds & GMC C3500HD Headers Exhaust Locate GMC C3500HD Exhaust Manifold Leak. Maintaining the exhaust manifold of your GMC C3500HD is crucial for optimal performance, ensuring it's free from cracks and leaks which are tell-tale signs a replacement is imminent. Regular inspections and prompt gasket replacements can extend its lifespan. When choosing a new manifold, consider cast iron for durability or tubular steel for better performance. Each type offers distinct advantages, but always opt for high-quality materials to withstand extreme temperatures. Installation tip: apply anti-seize to the bolts to facilitate future removal. Our online selection provides top-grade options to enhance your vehicle's efficiency and power, seamlessly fitting your specific model for a straightforward upgrade.