box tuning for a Fi BL 18

[AAAudio710]

ok i just went to comp and got a 143.7 with the shit box i usedonly tuned to 32hz and yet my sub peak at almost 50hz i plan on having Fi send me a new recone so it can handle up to 3000

now the max specs in my jeep compass are about 22 high 20 deep 38 wide and im trying to figure out a port

i want it to be able to hit good number but still sound good for daily use i need help with a port

they say after displacement put it in a 5 cube box the specs for my box are about 7.5 which leave me alot of room for the port this thing need can everyone help me here i also want the sub facing forward and the sub facing forward so then later wall it all off

oh yea by the way im using a soundstream XXX 4000 if you need the info on that

PLEASE HELP thank you