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The OEM setup includes an intake box that is sealed and pipes cold air in via a pipe that draws in air from the front of the car, which you can see forward of the intake. The BMS intake does not allow you to re-install the OEM intake cover because of the increased size of the filter. A typical BMS intake install will not have any type of heat shield (BMS does not make any type of cover), sucking in hot air from the engine bay. The purpose of this box is to create a barrier against the hot air in the engine bay and the intake, forcing the intake to suck air back through the OEM pipe. Of course this box does not create a perfect seal so some hot air will still seep in. The secondary purpose of the box is visual, hence the use of lexan rather an opaque material. Hope that clarifies what I was trying to achieve.
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