I am running 2 8" Bazooka tubes. I went that way because I tend to trade vehicles a lot and they are easy to remove and I don't have to keep building custom boxes. Also, with the 8" tubes I did not lose any clicks in moving my seats back.
I think they sound good but don't expect to be heard from a block away. But they do sound pretty good in a regular cab if installed correctly. They can be bought cheap on ebay, just watch for the difference between the EL8A and the EL8A-HP. The "A" has a 30W amp RMS (50W max) and the HP has a 50W RMS amp (100W peak). Also make sure that if you buy them on eBay that the auction includes the Bazooka harness...otherwise you will have to buy that directly from Bazooka and that will cost about $18 shipped.
They are mad easy to install. You only have to run the power wires to the battery, a good ground (I am using the bolt for my seats-must strip any paint) and a set of RCA's to the deck (if your deck does not have low level outs for a sub or rear channel you can use high-level inputs by tapping into your rear speaker wires).
I installed butt connectors on the wires so all I have to do is unplug the tubes and remove them if I want to carry something behind the seat or if I am going to park in a bad area.
My 2 tubes are the "A" models and still shake the windows and you can hear them very well from outside the truck. The only problem is that the bass is not as tight as it might be with "high quality, high cost subs with a seperate amp. I paid a total of $110 for both my tubes (from eBay) with the harnesses and $6 for the Y connectors (Rat Shack) that allows me to run 2 tubes from one set of sub outs from my Sony deck. I am happy, and after doing the install can defintely tell you the ins and outs of installing these things.
Oh yeah, they make RS series tubes now that put out 75W RMS and 150W max, but they are costly because they are relatively new...Its hard to find good prices even on eBay for those.
