We like to keep the filters as high off the ground as possible. Many people believe that the lower or closer to the ground you can get the filter the better. The problem is that as you get closer to the ground you are in fact pulling warmer air. The air closest to the ground is heated by the asphalt. You would be amazed at the differences in air temperature as you get higher off the ground.
Also, the closer you get to the ground the more likely you are to catch road debris, dirt, and of course your chances of hydro-locking increase as well.
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