I personally think the recommendations are off. I almost exclusively have used Aero's and will continue too. That being said. I have a general rule of thumb I follow.
3 cubes = single 6"
6 cubes = single 8", dual 6"
Scale that up to 18 cube, and you could run 3 8's for nice lower daily tune, or 4 if you wanted a bit more port, a bit peakier response, and a bit higher tune.
4th 2012 Db Drag WF Street Stock 150.8db
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