There is a show on speed chaneel called American Thunder, they did a comparison with Harley pipes. They even dyno tetsed. They broke the pipes down into catagories 2 into 1, duals, with baffles, without. It was a pretty good test and they tested every pipe on the market at the time. All of the pipes were within 2-4hp from each other, and they used the same bike for each set of pipes. Basically it broke down to looks and price of the pipes. Do you think the same results will happen with the Rhino exhaust?