how the hell do you custom remap a car a rolling road.....where does he get is lambda values from?
I custom map cars without a rolling road very frequently, although for some things you do need a rolling road for most of the map you dont.
However in this case it will NOT be a custom map, it will just be an off the shelf file they have installed.
I bet they didnt even fit a wideband on his car, all they will have done is:
Drive the vehicle to make sure no obvious faults, no management light no splutters etc
Connect upto the ODB, read off his file.
Merge his vehicle identity information from that file into their off the shelf modified file.
Flash the new file.
Test drive to make sure its ok.
NOTHING wrong with that at all, works fine and in fact some of the systems I use we do exactly that as well, but its NOT a "custom map" and its wrong to make the customer think it is IMHO.
It is a BIG step up from not doing the merge and just throwing on a generic file that has all the immobiliser information removed etc like some companies out there do.