need help with two 9515 dd in 95 tahoe

[dirtyrat85]

hey guys im new to this I have two 9515s needing help on an enclosure not sure which size to build wanting to be around a 35 on the tune room is not a problem thanks

[DbDesigns]

subs up port back 3.5 cu ft per woofer with 18sq inches of port per cu ft.

[dirtyrat85]

thanks