Not too big. I would go 5cu ft tuned to 35hz, a lot more port area and double the power.
Custom box builds for FL:
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Refs: diyma-sold to:Mazda3SQ CA.com-traded:matrxx dude CACO- Sold to: Ajax_6154, brandonb1029, TeejayBee, xx-wade-xx, traded with: papito FLSPL- Bought from:98chevySPL, JBLCAMRY, traded with:97montecarlo, thumpenranger