wall setup for 02 silverado exc cab

[1loudZ71 10+ year member]

im walling off my truck do to 4 subs.. my goal is to move alot of air and do hairtricks I wanted to go with 18's but after talking to some people im told i will not have enough air space for the 18's and that i should go with 4 15's. im looking for some input on who is right in my mind the more corearea the more air it should move but maybe im looking at this wrong both will be off the same power 4 2500.1 amps and a wall design from someone like pro rabbit or ram designs

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