"Your not going to get any benifit from splitting the exhaust and then just running it back to a single. Keeping it split will let it breath better give you more HP!"
Well...not quite true. It depends entirely on the muffler and the size of the inlet/outlet pipe(s). Also most engines run better if they have some modest backpressure. So he may have a two-in one-out muffler that is perfectly fine. Many are.
