Performance Air Filter for GMC Sierra-Denali/Yukon-Denali-XLHigh Flow Filtration for GM Vortec & Duramax Platforms Who Its For: Engineered for GMC Sierra and Yukon owners running the legendary Vortec small block V8 family (4. 8L, 5. 3L, 6. 0L, 6. 2L), the massive 8. 1L L18, or the early Duramax 6. 6L diesel powerplants. The Symptom: The factory paper air filter in your GMC is a major bottleneck for fluid dynamics. These engines are essentially massive air pumps; however, the stock 10 micron cellulose filters