usaci = spl mic in kick, door can be open, classes are based on 4 ohm amp rating
street beat = same as usaci except play music for 30 seconds and its an average
Meca = spl mic at headrest level, door can be open, classes are based on fuse size and sub amount
DB Drag = spl mic on windsheild, car all closed
Bass Race = spl mic on windshield, car closed up 30 sec music average, part of DB Drag
These all are usually region specific, by that I mean the concentration of members are in a certin couple states of the US and overseas