Bazooka tubes are pretty pricey, and when considering buying them you have some pros and cons. They aren't super great subs, and the sound quality isn't fantastic, but it's satisfactory. They are really loud for what you're getting though, if you are into high volumes. They don't play very low, just like Mrsteve said, partly because they are ported subs and how they're designed. The nice things about them are that they're sturdy and easy to lug around. I wish I still had my RF tubes for backups when you go on trips where you need more space than a box will allow. They won't sound super fantastic, but I'd still take them over bandpass boxes. You can always get different tubes too. Really, the only thing that makes Bazookas different is that they stuff crazy amounts of polyfill in them to mimic a larger box so the sub will play louder. Most will always be ported.
The port should be facing towards the rear corner of the car. This is simply to maximize the bass by forcing the wave to hit the corner, travel up and around the ceiling to you to maximize the wave with minimum wave loss or interference. This is a very overgeneral explanation, but it's basically so that the bass waves don't crash into each other and cancel out.