When I bought my 3 door I checked the CO myself at my local mot station..it was around 7% at idle!! I spoke to Collins as I was getting some bits off them at the time and they said thats normal, I asked about borewash driving it round own etc - they gave me a funny look and said I shouldnt be driving it round town as its "not that sort of car".

I forget what the CO was it was redone at msd but it was under 3% anyway and a hell of a lot more driveable - it 'shunted' if you were in at a slightly higher gear than the speed of the car allowed. it does none of that with the new chip.