Based on my experience with the warm air pipes (preheater hose) on the DeLorean, those available from the DMC parts suppliers are superior in quality. The black hose is much softer and not as rigid as the original aluminum hose. In addition, the black preheater hose will separate under the intense heat from the manifolds. The only caveat about the aluminum preheater hose, is to add a small 3" rubber hose piece on the right hand aluminum coolant pipe near the preheater area. The aluminum preheater hose can rub the aluminum coolant pipe. Sincerely, Mike Pack