Can u do this?

[JLAudioEXTREME 10+ year member]

I want a little more SPL....I can't really go on a spending spree and buy some better subs and amps..But I was wondering if there is a way to increase the SPL without having to buy anything? Such as change feature of the box and or the car..I have a 95 5.0 coupe Mustang..Any suggestions please pot them!

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[Bumpin03 10+ year member]

If you don't already....having a ported box gives you more SPL then sealed. Also, dynamat your car.