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If you ground to the strut tower you wont have a problem with grounding.
You can't direct airflow in the port, you DONT want airflow at all. You want sound moving threw the port. If wind speed is over 10% the speed you will have port noise. Those people that have done the wedge have no idea how sound waves work. Making the port area smaller with the wedge only cause the waves to scatter more after the wedge causing destructive interference in the port.
I've been doing this for 16 years, worked for one of the largest sound companies in the world as the Head of the Speaker Department. Last install I did I used 2x 8 inch subs using the back seats to make a 6th order bandpass on 400 watts and still do 132db on the mic in a 48 chevy.
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