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So can I close up the rear port and port it out the side making it long or maybe leave it out the rear & turn the port on the inside in the front of the box to make the port longer?
Don't want to loose seating capacity.Why not flip up a seat and put your sub in about 2 cu. ft. ported to 28-32hz.
The boxes for the silverados are typically 4" tall on the back side and 6" or tall on the front inside due the middle hump in the floor.Ironically, an under-seat box in a truck is about the easiest place to cram in 84" of 3" pipe lol. Consider the box you have - 3x3 square port that is 12" long. Assuming 3/4" material for interior port walls that is taking up 0.1 cuft. 84" of 3" pipe takes up 0.4 cuft (accounting for outside diameter) so if your box is 36" long and 7" high at the front (I am guessing from the pictures you posted) adding 2" of depth would get you the extra space you need to fit the ports inside.
I hear ya man. I would love a 15, like an ultimax or HO 15, but it would require losing at least 1 seating position and that's not in my wheelhouse yet.... yet 🤣🤣Don't want to loose seating capacity.
Would aiming one to the left side & one to the right be good or should I try for something differentI like this idea. Not too intensive/time consuming and it will give you a good idea of what is possible