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Hey guys....I have a quick question. I am new to the car audio hobby and I have a Ford Fusion with an old JBL GT150 amp. I have put in a Sony Xplod XSL123 and it sounds good....but weak. It is in an old sealed box from a home theatre that is no longer sealed....and definitely not the right box for a car trunk. Anybody have any ideas on how to make a Super loud ported box for it?