[fikren]

no searching nessecary, the filter is in the pump. New filter=new pump, probley run in the 200-300 range from dealership.

Mazsports pump turns the system in to a return system but it is way expensive ~700.

I haven't seen many, if any, problems related to the fuel filter in the 8's. They are supposed to handle up to the recomended change out at 100k miles.

It would seem like everything your experiancing would fall into an electrical/ecu problem to me. Its hard to say on these cars, maybe when you reset the ecu it put it back into learning mode and will adjust itself over the next couple of days. I don't know if something like changing the coils/wires and then messing around with the alt could have made such a difference that your system was no longer running in the way the ecu had "learned" it was running.