I am redoing my system so decided to try some new subs. Fi Car Audio SSD 12 - D2 x 4. The build quality on these drivers seem great. Suspension is stiff, loads stiffer than my current RE Audio SR's. I've got my own custom box design which is a bit secret at the moment, there will be more details about this later. This will be a streetpounder style system. I have ~3KW :-) There will be more pics as the build continues.