Help With A Dodge Magnum

[07MAGNUM]

This is my first post and I wasn't sure where it belonged....Im workin on my magnum...Ive got 2 15" RE MT and two American Bass 150.1....im only runnin one sub and amp at the moment...the current box is 4 cubes plus port...tuned at 30hz...havent metered it after break in but initial metering was a 145 on the dash...the box is sub back port back right now and if i turn it sub up port up it get A LOT quieter....thats my delima...the box plans i have are for sub up port up and its the only thing i could come up with to get both subs in the car...the box would touch backseat and back hatch door...anything you guys could throw my way would deff be appreciated