Do I need dual wide bands?

[den999]

I have a Z06 which has two separate exhaust banks each of which has a O2 sensor before the cats. Do I need to buy two wide bands to do a good tune or just one? Also has anyone run the widebands to tune, then set them to narrow band and connect to the stock O2 connector to the PCM?

[EC_Tune]

Not necessary but you can. The 2nd will only add that bank's info to your log which will in effect give you an average of both banks.

[den999]

Thanks! I guess I'll just order one then. What is the preferred side to weld the bung?

[EC_Tune]

It has been said that number seven runs the leanest.

[12secSS]

Yup! Whenever possible, I stick my wideband in the driver's side. Best to tune for the leanest bank and run the other side rich as opposed to the opposite.