i recently bought an 18 off psychotherapist when i made the box it was 6 cf tuned to approx 34 hz. well its in the trunk of a buick lesabre and when the trunks closed theres only about an inch from the box to the trunk and the sub and port are both firing up. do i need to remake another box so theres more room for there air or is this ok? sorry im new to making enclosures