Our radiators are constructed of materials that provide better heat dissipation over stock units. For example, PA66 GF30 is a glass reinforced nylon material used by Behr to manufacture O.E. radiator side tanks. We use UNS A93003 aluminum alloy. See how they compare:

Additionally, our radiators do not become weak or brittle due to constant temperature cycling. Glass reinforced nylon will eventually deteriorate resulting in a cracked or broken radiator neck. This failure has become more common due to the increased temperatures in the current generation of BMW engines. The normal operating temperature of a Double Vanos engine is around 110° C (230° F). Unfortunately, there is no way to determine the actual engine temperature without special equipment. According to the BMW WDS, the instrument cluster temperature display will read normal between 75°-113° C (167°-235.4° F). Nylon just doesn't hold up under these conditions.

In short, our radiators dissipate more heat and they won't break. And should our radiator break, the original purchaser is covered by a lifetime guarantee. This even includes radiators that have been installed in track cars. (Racers: make sure your radiator is covered before you buy.)