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If the engine and trim of your 2008 Chevrolet Silverado include an EGR valve, you can find it towards the rear of the engine on the intake manifold. Not all vehicles of this model year come equipped with the EGR valve, as it depends on emission regulations. In cases where it is present and needs replacing, you can typically buy a new one from a nearby auto parts store like Autozone for approximately $200.
The location of the EGR valve on a 2008 Chevy Silverado is at the rear of the intake manifold close to the firewall in the back of the engine compartment.