a work mate of mine has just picked up his focus RS, it has a bluefin superchip installed and a de-cat pipe in the boot that was previously on the car.

the CEL is comming on with the fault code for overboost so we have uninstaled the bluefin and returned the car back to standard.

the boost peak at 1.4/5 and dropped back to 1.2 with the bluefin installed, with the bluefin software removed it now peaks at 1.2 and drops back to 0.9bar

has anyone else had this problem before with an overboost CEL on an RS???

thanks for any help

jonny