I am looking at getting a 200 amp alternator and the company i am getting it from also has a device that allows you to adjust the voltage to where you want it. Lets say for instance i set the alt for a 16 volt system and i get a battery that is 16 volts will i damage any of my cars electrical because it is 16 volts instead of 12? or would i be ok?
16 is well into the range where stock electrical components start to get unhappy.
It would be idiotic to risk your computer for a power gain you almost certainly won't hear anyway.
A car is ~14v. If you want more power get an amp that produces more power at 14v.
The 15v+ amps are intended for extreme competitors that have dedicated high voltage charging systems that are isolated from the vehicles standard electronics.