But you didn't just add a sub . Also there are 8's under the seat that don't depend
as much on the body of the car for sound conduction for a good part of there range.
And a lot of people put subs in as a fashion statement.
And you can only tune the stock system so much .
If you ever looked at the specs on the stock system's
There rated power is at 10 percent distortion.
https://www.e90post.com/forums/showthread.php?t=1144129
output chip specs for L7 in the above link.