its not really a tuned port if there is no depth
from what i can tell, if you go with the last design, you'll be tuned to around 60Hz, only for burp machines. sounds absolutely HORRIBLE for daily drive and music...
best off extending the port maybe 10-12 inches, which should tune to around 32-35 Hz
use a port calculator and i would say tune the port to around 32-34 hz for daily use. mines tuned to 39 and i think its too high, misses some of the low lowss
but check out this port calculator, at the bottom of the page
http://www.carstereo.com/help/Articles.cfm?id=31
i love seeing ideas pop around and watchin em shape shift, its gonna look good and sound absolutely amazing if its done just right.... good subs great car
car pics CAR PICS!!!!