Terry all of the AC line is made by Champion. Champion Labs makes M1, STP, Bosch, Duestch(sp), AC/Delco,Tech 2000/Super Tech and KN that I am aware of. They will build to spec. and will design for you as well. The M1 has better base plate, ADV and better media then the other's. The AC/Delc UPF line uses the same media as M1 but a cheaper can and ADV. The Super Tech. and Tech 2000 line are identical to the reqular Delco Brand currently. I always check the whole pattern on the base plate. Some of the Tech 2000 and Super Tech's are made by Fram and can be spoted this way. I always used to recomend the AC/Delco brand as a good value until they restricted distribution channels.
