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Well Im not sure of how much weight you will have in the car.... It all depends on what material they use....

You might want to start a new thread

1 12inch sub in a Civic will do the job. Im running a 12inch Earthquack in my car and it does the job. But if you want really big power you should go for 1 15inch sub. Bare in mind the bigger the sub...

Nice setup you got there...

Go to any Car Audio specialist and they will be able to do a DB testing.