QUESTION #1 - I have a 2004 BMW 525i, and I love it, but the stereo sucked to be honest. So I decided to get 2, 12" kicker COMP r Sub-woofers. They really do pack the punch, but I read all across the internet to find a way to port the air into the cabin of the car from the trunk.
Are there any ways or recommendations to port two sub woofers into the cabin?
The box is ported in-between both sub-woofers, meaning both subs are ported into one port in the center of the box.
I just want a little bit louder and clearer sound.
QUESTION #2 - What is the best option to louden' up the Harmon/Kardon Speakers, I have not been able to find a aftermarket amplifier for the 525i. If anyone knows a way to, or of an amplifier that would work, please let me know!
I really appreciate it guys! take care


The picture uploaded is an example of the box