Does anyone know if this has been done?
If so what are the pros & cons and where they are available from and how much etc?
I would have thought Courtenay would sell them but they only advertise for the Cav and Calibra:
http://www.courtenaysport.co.uk/default.htm (click "tuning" near top left, then Calibra & Cavalier Turbo, then scroll down a bit).
It doesn't look like you get much for £515!