The directions are in the video that i made.. U cant really hear much of a difference over the camera. But there is defiantly a deeper tone from the interior during hard acceleration, and free reving. Its much more responsive, and seems to accelorate better.
http://www.youtube.com/watch?v=nL0c2yXZ6uQ
http://www.youtube.com/watch?v=nL0c2yXZ6uQ