hi i want to know how much did you guys paid for upgraded alternator. im up to point that if i do more stuff to my car that i have to upgrade alternator. now i have 2 hifonic 2000 watt class d amp or 1600 what rms audiobhan amp that i want to install in my car. but i know that my stock alternator wouldnt work on it anymore. soo any help will be great.