From my personal experience the factory style drop base that comes with the open element breather assemby on SS and Z/28 cars offer the most drop. I fit a Six inch K/N filter under a cowl hood on a hot rod I had years back. I did have to do approx 1/2" of trimming on the rear of the hood opening for clearance. I could see the filter through the back side of the hood when sitting in the car.
I dont suggest this on a high profile or originl car by no means.
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