The ecu cuts the fuel when it senses the clutch, this results in what seems like turbo lag, but is really the ecu cutting fuel. If you disconnect the sensor the ecu defaults to not cutting the fuel. It goes like a rocket after that, none of the classic td5 sluggishness as you go to second after you take off from the lights. Do a Google search on td5 clutch sensor and you will find a technical write up as to why this works.

I was sceptical, but it takes 2 seconds to disconnect, just don't lose the little metal wire clip. I was surprised at the difference it made.