ok sou you know how the stock bose can sound "good " at 19 what kind of system would i need if i want that to be the halfway point and not blow speakers?

It can all depend on what you want done how custom you want to get and so on. There is no real "average"

how much is the avg system u do?

How many? Probably around 25 or so. I lost count lol.

so how many systems have you put in 370z's?