Ported Box For 150db?

[Geminidj2000 10+ year member]

currently i have my idmax v.3 in a sealed box mt and my friend are gonna make a box for db drags........... i wanna hit around 150 dbs im running a hifonis hercules amp and second skin damping material whats size should we make the box? I have a trunk also not a hatch back and my amp has a subsonic filter on it what size should i make the box and What should i tune the box to?

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[Geminidj2000 10+ year member]

how do you know your cars resonant frequency?

 

[BASSBOY 10+ year member]

is there any way to possibly guesstimate resonance frequencys? cause i am building a new box soon and i would like to use this new piece of info.