In Steve's opinion (and who am I to disagree), they were well out of balance. Now to be fair to CC, there was a period of 4 or 5 months between my getting the upgrade done and taking the car to T&R, so it could have just taken time to work loose, or something... But Steve did have to fiddle around with the adjustments a lot before being satisfied with the idle and throttle response. It took him best part of an hour, before even starting on the mapping. In general I was happy with the work CC did: It was done on time and at a reasonable price. I did have a failed airflow sensor shortly after the work was done (I can't blame CC for this), but they collected the car, fixed it, and delivered it back to me free-of-charge within 3 days. Mike