Not sure which 2005 GMC Envoy Air Intake Systems are right for you? We have over 274 customer reviews, with an average rating of 4.5, to help you find exactly what you're looking for. Woody L from Hubert, NC said, "The installation process was fairly simple. Everything fit as required. Noticeable power increase at higher rpm's. Fuel economy has increased by 1-2 miles a gallon. Overall, very happy with this product."