Banks Power Racing Exhaust Manifold 01-16 Duramax LBZ-LML Race Ported (Hardware Not Included)If you are a racer and have an LBZ LML 6. 6L Duramax, Gale Banks Engineering offers The best cast Duramax manifold ever. Lay the power down with Banks Big Hoss Duramax Exhaust Manifolds! For high performance, getting the exhaust gasses out of an engine is just as important as getting air into it. These race ready, high flow manifolds were designed by Banks for the ultimate in fit and performance. Does NOT work with OEM or aftermarket up pipes