Engine in question:
Alfa 166 3.0 24V
Emerald ECU
GTA inlet cams and injectors
No CAT's or Lambda fitted.

Last year's MOT (January) results were:
Front bank - 2.339%
Rear bank - 3.448%

This year's MOT (March) results are:
Front bank - 0.290%
Rear bank - 1.099%

I assume the MOT kit is correctly calibrated and I'm sure I've not been playing with the ECU. Both cold times of the year and engine was up to temperature.

Any ideas why the reduction? Fuel? The front bank is seriously lean and I'm concerned for the valves :-)