I used to compete in IASCA. My former system had 2 12's in a sealed enclosure. I just bought my Impala and can see that the free-air solution seems to be the best for the layout of the trunk, since I want to keep the space. It seems that JL and Kicker no longer make IB type subs. What do you recommend for the Baffle Board arrangement? Also, do you have to cut the sheet metal? There seems to be a lot of it in the way. I've already done a pretty good 'search', so forgive me for asking a redundant question. Thanks.