Hi and welcome to the site (I noticed this is post 6 for you) These Subs get a pretty bad review. Supposedly they flex like hell.. I don't know either way but I am yet to hear a good thing about them.. But then again some of the detractors have their own subs on the market. Hope it works for you. Let us know how it works once you get it together....
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PS I head the down bars (firewall to sub) help with the flex so you shoud look into them.