r u sure ? i dun think so ..... under my seat i still got aircond ventilate the thing ..... but in the trunk there ain't no air circulating in it ...... so i dun believe in mounting in the trunk can be cooler ..... under the seat when i start the car i still have the aircondition cooling it ...... but in the trunk there ain't no air going in ..... my changer is clarion the i also dunno what model but for wira stock head unit ..... 6 disc ..... space under there is more than enough for the air to go through .... all i need is to control the blower to blow twin flow