The Cartech or BEGI unit is the one that was sold with the Hahn kit. The Vortech SFMU was often regarded as a better unit but either will work. As far as a wideband, you can pick up one of them fairly cheap used on tuners, I may even have one for sale if I can find all the harnesses for it. It can be put together for a reasonable price, esp since a lot of people are just jumping to a 1:1 rising rate regulator and MS...there is TONS of info on this site, just search around for it!
