when i take mine off the only differance it makes is the revs stop dropping below 900 rpm when you change gears at full boost... with it on it just dies... i presume its because my d/v goes on for too long, its abit like ptschhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh hhhhhhh at full boost... thats why i want to try a new one