hey guys a friend of mine just bought a 2008 silverado flatbed and he want to put three or four 15's in there...he wanted to know will he have to do a blow through or not

is it an extended cab? crew cab?

crew

yeah, its possible the, just take out all the rear seats and that should be plenty of room to wall it.

if he dont wanna he probably dont even have to wall. just sacrifice the rear seats. subs up, port up can. you can probably get at leat 55 inches wide x 25 inches high x 30 inches deep. that alone will give you at least 15 cubes net. perfect for 4 15s.