Which wideband should I use with AEM EMS?

[Shane@DBPerformance]

AEM will work with no wideband at all. Even if you have one, it usually isn't used until the car has warmed up some. A factory car doesn't use it's O2 sensor right away either, they usually run in open loop for a bit after starting.

If it doesn't want to fire during cranking then play with the Crank Injector Time Table, it might need more fuel with the cold weather. If it fires, starts and then dies, then you might have to play with the Warm Up Enrichment, Start Extra Deacy, Start Extra Time, Idle and other tables.