Already wanting louder.

[dudeogo]

I would forget about getting or even adding more subs at the moment.
Try building yourself a 4th and port through the rear deck. You'll get a nice bandwidth from that sub and should be quite a bit louder since you'll be porting directly into the cabin. You could actually squeeze two of them back there if you're willing to build inside the trunk.

Here is a video of two sa12's in a rear deck lid blowthrough

Sounds great.

 

[BOOMINGRANDPA 5,000+ posts]

I've always said (even on another post today) "THE BOX IS KING"!! 8 yrs ago I made a old pioneer 304 12" pound off of a "500" watt sony amp with a good ported box in a guys dodge neon lol