If your talking about in front of BOTH rear tires, its not possible. The only way you can do dual side exit exhaust is if they both exit on the pass. side. Its not possible to exit on the driver side because the gas tank is in the way.
I have a single coming out the passenger side just in front of the rear wheel well with a dual tip and a flowmaster 40 series. It is real sick looking I think in my opinion. It isn't mad loud or anything (not to mention it is only a 3.0L) but it sound better than the stock and I like the look. I had a straight pipe after the cats for a while and after I put the muffler on it deffinatly shifted better and ran smoother over all. I will load a pic tommarrow after school for you and put it in as my main pic for posts.