I was expirimenting with the SET valve , that is supposed to improve low rpm performance and found that my bike feels like it runs allot better with it un hooked or all the way open to allow maximum exhaust flow. If you unhook it, it is spring loaded to the fully opened position. Now granted I have also modified my stock exhaust with a 1 3/8 hole saw and richened the fuel mixture by using a 3.3 k ohm resistor at the IAT SENSOR connector to make the computer think it is 30 degrees air entering the air box. The last thing Have done was un hook the SET valve and it DEFINITELY has more power from idle to redline. P.S. DOOR BELL JUST RANG AND MY JACKET JUST ARRIVED .