• GMC Yukon / Yukon XL / Envoy. • Chevy Tahoe / Suburban / Trailblazer. New engine intake manifold (Part #615-183). • Chevy Silverado 1500 / 2500 / 3500. • GMC Sierra 1500 / 2500 / 3500. If you have a cracked manifold or a vacuum leak, this is the fix.