10" and 12" in VS ute enclosure?

[Jamie-b]

Hey,
ATM I have a 10" fusion sub boxed under the tray in my vs ute next to the fuel tank. Im after more bass, and after much thought the only reasonable place i could put another sub was ontop of the sub box thats already in, however i have absolutely no idea when it comes to stuff like this, so is it possible to mount to subs in the one box, or will it **** shit up?
I attached a picture so you understand what i mean.

[wraith]

Use the 12" inch. Using 2 different size subs doesn't work effectively.

[madnuts]

best thing to do is port it into cab the through the air vent will be alot louder

[Jamie-b]

Use the 12" inch. Using 2 different size subs doesn't work effectively.

Hmm ok, ive already got that box in with the 10", but i need more bass!!!

best thing to do is port it into cab the through the air vent will be alot louder

Do you mean to remove the things infront of the circle holes behind the passenger seat? because ive already done that...