Is it a good idea to have one?,and is it something you can fit yourself
if you get the Unit and the Harness?

 

Someone ?

 

Ok sod it i give up !!!!

 

I believe they are very easy to fit if you get the harness, but also pointless IMO. Either just drive off boost for the last couple of minutes of your journey or sit in the car and manually switch off after a couple of mins.