I'm assuming that you have no idea just how much louder 20dB over the stock JDM box would actually be? To give you a hint, every 3dB is a DOUBLING of volume, so if the stock 'box was 90dB then 93dB would be twice as loud, and 96dB would be twice as loud as that and so on...!
So what does that make my 122DB
...fighter jet loud ...
That was before the s/c went on, its even louder now