2007-2008 GM 1500 Cold Air Intake Kit (75-5021)Description Maximum Performance S&B's cold air intake for the 2007 2008 Silverado Sierra 1500 was engineered to minimize air restriction and flows 47. 5% better than stock. This kit comes with a fully enclosed airbox that protects the filter from dirt and keeps out engine heat. Protect Your Engine This kit comes with a massive, highly efficient air filter that results in better performance and protects your engine. Available in either 8 layer Cotton