even if you get a box like that, and its tuned correctly it amplifies the low very low frequencies. i had a box like this before, it really only sounds good with rap music. if you listen to country or rock where you want a fuller range, you are going to want to get sealed box any way. this last time i made custom sealed boxes for spec'ed for the woofers and its the best ive had for those types of music. there not hard to build im sure you could find a local fabricator to cut and router the pieces, then you could put it together the right way.
1998 Bonneville SSE
2007 Monte Carlo LT-KYB, Clarion, Polk audio, Kicker
1999 Yukon SLE-KYB, Air lift, Reese dual-cam, Tekonsha
1987 Firebird-355/th400-nothing stock