Im thinking about running 2 sundown sa-12s in a custom box with aeroport. ill most likely have to buy an after market battery and alternator if anyone is selling a 200+ amp alternator to fit a 2010 mazda 3 sport hatchback. However, im thinking about a number of possible amps. so far im leaning toward a hifonics brx-2400. i would prefer the amp to be less than 300 before shipping, duty, etc. Thanks for reading guys!