sub options with restrictions

I'm doing a customer's ride and need some low end in a serious way. The first problem is that it is a 97 BMW 328 convertible. 5s in the kicks and rear quarters, and a 3 and tweet in the doors. Not alot of options for free room anywhere as he is a golfer and the trunk is the size of a damn suitcase. Last limitation: I install at Best Buy and there is a huge ban on glass work. I'm thinking bout 400 plus amp and a slim ten on the left side of the trunk facing back. Any suggestions or ideas are welcome. Haven't got a lot of convertible experience in the sub area, so help me out here.boosh!!

I did a Dodge Viper once where I faced the same challeges. I ended up putting a 12 in the floorboard on the passenger side behind the OEM carpet. A day's work and no glass. Looked and sounded awsome.Prepare your future. It wasn't the lack of stones that killed the stone age.