tis true, the glassing part wont be too bad, i have a 4dr pickup and always use enclosures between the seats, the best sounding enclosure so far has been a downfiring 12" in 1 cube. it makes the substage sound like its in front of me and its pretty accurate.Enclosures inside of car cabins usually **** too unless done right. What your wantin to do is the same concept of just sittin a sub in the back seat in a sealed box. How often does that sound good?