Need help planning box

[812mcmurray 10+ year member]

hey everyone i have a 98 chevy ext cab and have taken out my back seat. i have RE audio sx 18s. i need input. i have a box built that was used in a truck like mine but i want it bigger. or would using 1 18 with a bigger box make a bigger deeper sound? im thinking about 8 cu ft tuned 30-32hz. or taking up the whole back of the cab. but i would need some assistance.

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[dappa5 10+ year member]

p m me i'll do some thing up