rear exit duals or single is not recommended for towing due to carbon monoxide entering the vent system of a towed vehicle and increased noise. dual side rear exits should be able to be done with no problems.

 

i'm running true duals 2 1/2 exhaust exiting out each corner at a 45 degree angle. I did not prefer the look of a 90 degree exit, and I am able to pull with no worries and no problems. I had it done at a local exhaust shop.