I ran custom side exits up until about a year ago. My setup was long tubes to a short O/R x-pipe, directly connected to two Borla XR-1 mufflers tucked up in the drive tunnel and then a 90* bend exiting right in front of the rear wheels.
The fumes were pretty bad sitting in traffic for long periods of time and in drive-thru lines.
I liked the way it looked at first and it was pretty loud, but it was a big experiment I ended up not liking after all. I missed the clean look of the tail pipes, and that distinctive 4V sound that I lost after cutting 5 feet of pipe off and putting in the x-pipes.
I ended running over a curb because some asshole was on my tail when I was turning right and I broke the hangars on the pass. side and decided to cut them off and dump it until I could get a cat-back. I'm about to order it!!
I'll get pictures as soon as I get home from school