I have the Trimill Bobcat that I got from Jack Duncan. If you bring up his White Bandit build you will see it there. Personally I think it's the way to go although maybe having a true muffler would be easier on the ears
There is also a company that makes an exhaust that goes forward and exits in front of the rear wheels. I think it is called GDOWN or something. I posted a link back in July or August.