There's not an over abundant amount of space in the hatch of a TC. 3-3.5 should be do-able though. You will probably have to put subs up if you are running 12's. I don't think you could fit them facing the rear if you want to have a chance at clearing the hatch.
My stepson has one of these, we just finished his stuff a month ago or so.
I think you can get about 30-32" wide, +/-26" deep and prob a max of 12" tall. More if you are closer to the back of the seat. Any higher than that and you cant use the hatch cover.
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Yous just figures that out? All the hots ones is crazy!...And deh ugly ones too. - Toki Wartooth