box question

[csu87 10+ year member]

so i have the plan to either do 2 seperate boxes for my apxx18, one for comps and one for daily, or interchangeable ports. my question is, i have a 4.1 cuft box that i could retune and throw my apxx18 in as a burp box. if i tune the box to 43(currently 33) it would make the box about 4.5-4.6 after displacements. would this be an ok burp box or is it too small

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