First off that box is too small to be ported, it's a net volume of 2.36ft^3 on the inside if my math is correct. Those subs require about 1.5ft^3 each at a minimum.

You could however do an EXTERNAL port.

Take 2 4" diameter PVC pipes and cut them at 15" lengths take a bowl and set it face down on the ground, heat up the PVC pipe until its malable and shove it onto the bowl to create a lip on the PVC then screw it to the 4" diameter holes in the box you've created. Take some foam (like the stuff put in pillows) and put some in the boxes edges to create a bigger box.

This should put you at around 3 cubes theoretically and will put you @ 38hz with 12in^3 or port area per ft^3.

This is the only way I could see it being done without building a new box and people do it all the time.

https://www.youtube.com/watch?v=gX6PG3TN9D0

theres one 8" external Aero port, you could do this but with 2 4" diameter 15" length PVC pipes, just put them on the outside of your box and throw a little pillow foam on the inside to make the box act bigger because im telling you 2.35ft^3 is tiny for 2 12's , 3ft^3 is more optimal.

Just remember if you take my suggestion the PVC has to be 4" diameter HAS TO BE and cannot be any longer or shorter than 15" or else your tuning will be incredible high and you wont have enough port area and it will sound worse than it already does.

Also you will need some of that pillow foam or expanding foam heres some science behind it:
http://www.data-bass.com/data?page=content&id=79

http://www.subwoofer-builder.com/speaker-stuffing.htm

and here is where you can get the stuffing make sure you buy this stuff since it works the best and dont use too much of it:

http://www.crutchfield.com/S-I88wT2Lq4xa/p_027808/Polyester-Fiber-Stuffing-1-pound-pack.html

Also the bowl method works GREAT for creating a lip to screw the PVC down. Just heat the PVC throw it on the bowl bottom push down and it will curl the end kind of like pressing a straw down on a marble.

I can say 38hz @ 3ft^3 and 12 inches per ft^3 port should sound decently good on rock and most rap. If you want lows or bass that moves air you need to just get a new box with low tuning.

Sounds good thank you for the reply il look up these links.

Just one last question,if I was to get a new or build a bigger box. Will it actually make a big difference? In your opinion is my set up worth getting something bigger/better?

Id save up and get something better instead of sinking more money into a mediocre setup. A ported pox will make it louder but no so much louder that it will be a crazy difference. A external port could be a option for you but with that box being thwt small i would shy away from those 2 aero ports.

Considering your current box is sealed and small for even a sealed box depending on the woofers yes ported makes a HUGE difference. Night and Day.
I can say a properly ported box can be easily twice as loud as a sealed one.
Don't go buy a prefab though or it'll only hit high highs and wont sound good with the specific woofer more than likely.

If you want I can design a box for you and give you a cut sheet, you can bring it to lowers grab some MDF and have them cut the pieces then just find someone you know whos decent with wood working to assemble the pieces, really not that hard and should only cost you like $50 PM me if you're interested.

Il look into building one myself and keep this enclosed box just in case it doesn't go so well or if I don't prefer the sound.
Considering I paid 50$ for this set up and 30$ for a foam repair kit to repair my subs. I don't mind leaving it as is. It still makes a big difference in my car for having a system under 70$ total.