how to fire my subs

[hmmm... 0]

i measured my truck dimensions for where sub will go. ( i cant fit that 15 inch so i guess im going 12

well with my space requirements i can either fit the sub firing downwards or firing forwards/backwards. the problem is its a tite fit so if i build it to downfire it wont fit if i face it forwards, forwards wont fit firing downwards.

which way should i face it? what differences will forwards or downwards have.

i refuse to face it upwards becuase my luck ill drop something right on it. and i cant find any nice grills for high excursion subs.