I thought that it was working ,ive got a digi adjuster mounted which was wired in and the lights on the display came on when the car was started.And yes i took there word for it,guess i dont know much bout trc,but ive been pushing the car hard through corners and not crashed so i cant say.I cant remember feeling much of a dramatic difference when it was newly fitted,as peeps all said that you can definetley know when its on/off,guess i dont feel much then.Its all v embarassing anyways.