So i went to this place nearby that does professional audio installation. Im running a g37 '12 sedan with the bose soundsystem.

The rundown was this:
Alpine amp
Pioneer 12" with box
Interface to power everything? he said it was like a reducer cause the power from the 2 amps already
Wires
Labor

$874

does this sound right? Otherwise what do you all sugest

 

Look at wickedcas box

 

I think it depends on how much sound you trying to get. For me in my coupe I did not want to sacrifice already minimal trunk space. So my box is minimal.




My build was roughly $2500. Included Alpine amp, alpine type r speakers all around

My install here