The Z4 Aluminum Radiator is suited for the 2.5i M54 and 3.0i M54 Z4s equipped with automatic transmissions. It also fits all S54 Z4 M Coupes and M Roadsters. (See the chart near the bottom of this page.) It is a direct replacement for the factory part, so there won't be any fitment issues. Just take out the old plastic radiator and replace it with our version. All the stock accessories will mount to the new unit without modification.



Our radiators are constructed of materials that provide better heat dissipation. For example, PA66 GF30 is a glass reinforced nylon material used by Behr to manufacture O.E. radiator side tanks. UNS A93003 is the aluminum alloy we use in our radiators.

Thermal Conductivity	Specific Heat Capacity
PA66 GF30	0.22 - 0.5 W/m-K	PA66 GF30	1.2 - 2.35 J/g °C
UNS A93003	193 W/m-K	UNS A93003	0.893 J/g °C

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 tell what the real temperature is in the engine 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 e46 radiator dissipates more heat and it won't break. And should it break, the original purchaser is covered by a lifetime guarantee... even if it's installed in a race car.