I have a 2012 chevy silverado crew cab. Thinking of taking out the 60 of the 60/40 rear seats, and doing a single 15 ported. My question is what would be the most effective sub and port placement. Sub up, port up ext... I haven't decided on what brand of 15 yet. I have around 1000w of power. If that matters with sub and port placement. Thanks for the help.