As far as a wideband o2, it tells you the absolute air fuel ratio in a real number i.e. 12.8,13.2, etc. If tuning with laptop software it becomes much easier to use an existing rear o2 bung, as you can simply turn off the rears. A good wideband system is an LM1 or LM2. Affordable and easy to operate. We have an LM2 for the shop portable unit. Primarily used for tuning open loop cars and speed density conversions. Otherwise, we simply use the dyno unit for pulls. Our personal cars have Dynojet wideband commanders mounted permanently inside. I always want to know my A/F ratio.
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