2 subs sealed or 1 sub ported?

[04glr 10+ year member]

I have a rear deck with 2 factory "subs". I want to remove these and build a box mounted under the rear deck with the subs facing into the car.  Should I do 2 subs sealed, or one sub ported with the port facing into the car?  Which will be louder?

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[THATpurpleKUSH 5,000+ posts]

What kind of car?

 

[04glr 10+ year member]

2016 cadillac cts sedan.  I forgot to mention that I will be doing shallow subs most likely 8", maybe 10".

 

[THATpurpleKUSH 5,000+ posts]

Why would you want to use shallow subs when you don't have a truck or mounting depth restrictions?

 

[04glr 10+ year member]

I need my trunk space.  The max mounting depth I can go for the box is 5 inches