if your lucky they might do 50% of rated, and sound like shit....im not sure about long term reliabilty...if you need budget, look at Audiopipe, Hifonics, Crunch etc.they just dont put out what they say
it does take some power from my truck though my tach drops from 1000 to about 500 on idle when a heavy beat drops.. along with my head lights ofcourse..I think these are fused at 60 amps, He would be lucky to get 800 out of it.