Question (Do you not have a problem getting the sub volume into the cabin, or did you port them ? )
Answer - The sub volume is ample in the car and no i didn't port, i have a nissan 200sti as well with a complete kenwood competition system and you can hear that car from a 100 miles away. I then decided that the bm is a very elegant car and to be honest i didn't want it to sound "GAM" with 2 much bass so i went with clarity with a bit of bass.
Question (Very nice sound install. Who did your installation.)
Answer - i had soundmatch install the speakers inside the car cause i didn't want to go threw that effort, by the way they charged me R250 for installation cause they didn't know how a big job it was and it took 3 guy's 6hours 30minutes to install the speakers inside the car and i did the boot install myself cause i wanted it done in a very clean way.
All i'm looking for now is a 330i sport pack front and rear bumper and spots.