only a few small things could help you get another dB . . .
but dont think its that easy to get to 150!
remember 3dB is equal to being TWICE as loud! so there is a big way to go!
but for 1, smoothing / rounding the port, try changing the way it loads off the car too if you can move the box atall, stop that boot rattling! stop the roof and floor flexing! and you should be there mate!
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