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I looked at a number of fan systems to resolve the air flow problem , in the end I used a 2002 Viper fan . It came with a shroud with four small rubber flaps along the side to allow air to pass at cruising speed, removing the hot air and smells from the engine and reducing the turbulence , they close at low speed to channel the air into the radiator . It is a two speed system . I Installed an over ride switch so if it is a very hot day or I,m in traffic I can switch to high but that is not very often. This system works great and it is on a relay located close to the fan and feed direct.