I have a 2008 Sierra crew cab (four full doors) I have a single 10" IDMax that I want to put under the passenger side rear seat. The mounting depth is too much to just stick the box under the seat.

Has anyone cut the felt out from under the seat and/or measured how much room is available? I don't want to cut my seat up if there isn't enough room and I can't find anywhere on line that has this type of information.

this is the set up I'm using.