UL 914 engine muffler

Friends of the forum, I have a Storm RG with 914 UL engine serial number 4418046 with 400 hours of operation. And I come to ask for the suggestion of the experts and owners about the change that a friend made in his plane. In his case his is a Dyamic with a 914 Ul engine and replaced his ciliencioso with a direct exhaust pipe, where we can perceive a better response when the engine when accelerating and the noise that had a small increase. I think about doing the same in my engine to have a better response to acceleration, having the turbine discharge more free; What do you think and recommend?