My (2) 2005 Model Solo-Baric Kicker L5 12" Subwoofers came in the mail yesterday. Time to buy a box. My friend has an old box he used to use for his L7's that he does use anymore that he will sell me for 125. It's a good sized box (not sure how big exactly) It is ported, black carpet. On one side it has 2 plexiglass cutouts to where you can see inside the box. The thing that makes the airflow go to the port in the inside is also plexiglass. Now my question is, do I buy this box for my L5's, or do I spend 150-200 getting just a regular ported box. Again, I know nothing about box tuneing or any of that.