I DO! I went to 2 competitions this past year.. placed 3rd in SS601&up class in USACi event with a score of 153.9 db's, and 2nd overall in a local bass comp with a score of 149.8 db's (accurate meter).

I have 2 solo 12's, 2 Memphis 1500d's, 2 optima red's, Alpine deck, stinger wiring, and a badace box tuned to burp at 53 Hz.

It makes some noise for sitting in the trunk of a Ford Taurus.