Please see the NeedsWings Thermal Coated Aluminum Intake Manifolds description here.  This product includes everything from our Intake Manifolds and we then have the exterior coated with a gold ceramic thermal coating and still do the teflon velocity coating on the inside.  This gives us the best of both worlds so to speak.  We get the heat reflectivity on the outsides of the tubes with the gold ceramic thermal coating which repells under hood heat, and also have the teflon velocity coating for the flow increase inside the system. 

The gold ceramic thermal coating color changes depending on what angle you look at it from. It ranges from gold - green - yellow - brown.   

Maximum effective temperature is 2,200 F