just looking at torres box cal i would make the box just a little bigger and tune it lower but thats just me i like the lows. i just dont get it says 2.5 sealed and 2.5 ported. i think it should have been 2.75 or 3.0 ported. look at the other sizes they differ from each other sealed vs ported so the 15 should to. thats why i say the box should be a little bigger but its up to you
actually looking at it again i would think it should be more around 3.0 to 3.25. good old power dvc's i love them subs. i had a pair of those, xlc's, punch he2's, power hx2's and a pair of just straight up punch's and i loved them all. the old school rf's would be the only ones i would ever buy. the new subs are complete garbage