midrange speaker tuning frequency

I have some midrange speakers that I'm trying to design a ported box for. I'm a bit confused about what frequency I should tune the port to.
Another question is: when tuning the box in WinISD, should I aim for a flat graph or a peak? The aim of the speakers is not SQ but rather loudness. but I am unsure if I am better off with a flat response or huge peaks at around 250 Hz (that's what I was able to reach with a non-negative port). I have atteched a picture of the "peak" respons box
 

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Well, the goal is to be loud, and that's why I'm unsure of the graph because they are loud, but will the sound be extremely trashy to the point where it is unusable with a huge peak like that? They will be going into a car.

I'll have four TT-008 from TT-technology in the box.
with the T/S specs:
  • Resonant frequency (FS): 108.885 Hz
  • DC resistance (RE): 3,7Ω
  • Electrical Q-factor (QES): 0.913
  • Mechqanical Q-factor (Qms): 8.038
  • Total Q-factor (Qts): 0.82
  • Equivalent volume (VAS): 10.730 liter
  • Moving mass (MMS);13.243 gram
  • Sensitivity (SPL): 93.681 dB
  • Effective piston area (sd): 21.642 cm2