Universally mounted trumpet ducts can be use for several purposes channel cool air to brakes or intakes,coolers, and can also work with large turbos. Great addition to maximize the efficiency of your performance parts. 2 construction choices to suite the individuals needs. Optional pair kit or single Pre drilled for secure mounting. Includes per duct 8/32x3/4" button head bolts(4) 8/32" backing washers(4) 8/32 stainless steel nuts (4). Template included. Drilling will be required.