No as long as you keep it a little on the rich side. The baffle is inside the rear of the muffler. You need to remove the nut from the back of the muffler and remove the end. After you take this off you will see a small disk inside it. Remove the disk and put the muffler back together is the same order you took it apart. Just make sure you get the nut and bolt tight. this will give you about 5 to 600 more rpms right off the bat. But you will also need to readjust the carb on the high end. Happy landings. Ernie...