If Ginge is right and 90% of the time you use your Cosworth its going to be below 70 deg C and out of closed loop, my advice would be to sell it in all honesty as A) its not good for it B) You shouldnt realky use boost hard when its cold so stuck with a slow car C) A TD is FAR better at what your trying to do. It will do 45+Mpg stone cold.!!