I have 2 Kicker comp Rs in separate prefab enclosure. they can't hit low and are very peaky..im looking for a good box design with a big port in the middle. Ive looked around a lot online and haven't been able to find anything specific other than http://www.caraudiofabrication.com/box-designs . I would be willing to pay the 65$ for the box design but is it worth it? I can use all of my trunk space so size isn't an issue.