i have subs and port facing up with the port on the passenger side. (edit: i removed my jump seats and built a false floor) 2 12in sx's and an autotek mm3000.1, there is a pic in my profile. 147 in the kick TL. my box is tuned to 32hz and as it is now, i gain over 4dbs with the drivers door open which sucks for db drag and bass race since you have to be sealed up. i bass raced a 139 flat with track 1 thug motivation //content.invisioncic.com/y282845/emoticons/eyebrow.gif.fe2c18d8720fe8c7eaed347b21ea05a5.gif
if i was you, i'd make swappable ports so you can find your trucks resonant frequency...