What do you guys think about it? I am thinking about getting a pair but I dont know where to put them. Can anyone give me some ideas, I was thinking about maybe putting it on the side panels?

 

I'd put them in a box... That's where subwoofers perform...

And by side panels, what do you mean? Do you mean the some what empty space behind the taillights? That is doable if you're handy with fiberglass and plastic filler.
Let us all know how it pans out!!!!!

 

yeah that space behind the tail lights.

 

are these 8" or 10"

 

neither it's 12" so im not quite sure if they will fit. I havent done any measurements or anything. Just trying to get an idea of where to place them.

 

I still suggest a properly designed ported enclosure, but I'm a bass head.

I recommend getting a tape measure and doing some measurements, as well as reading the owners manual of that particular subwoofer.
If you plan on utilizing the area behind the taillights, you can get fiberglass supplies at a number of local auto paint supply stores, Lowe's, Teh Home Depot, or even numerous online retailers.

 

From what I have seen those subs sound better in a sealed box made of 1/2" or 3/4" MDF