If you are realy serious about a bandpass, then you should look into having a shop make it for you. As stated in the previous posts the volume and port sizes are very critical to the performance. If you still want to give it a try, check out
http://www.ajdesigner.com/speaker/index.php
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 2003 Maroon Alero GLS Sedan. (Purchased new in 2003 with 18 miles, and sold in 2006)
2004 Toyota Corolla LE (Purchased new in 2003 with 87 original miles)
2007 Toyota Camry LE (12 original miles)
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