Yes I know its a newbie question, but I have read conflicting responses on the thread. All i remember is this:
- in the beta testing a wideband was required.
- Custom tunes Do not require a wideband 02.
Can anyone confirm if a Wideband is needed before you go to a dyno tuner? Being the first person to buy from Surgeline tuning in Portland they said I had $450 of free tuning. So I may as well take them up on that.




Luckily for us, the primary o2 sensor in the civic si is a partial wideband sensor. so in otherwords we can read our AFRs just fine but there arent "perfect". they jump around invalues a little. like cruising with my car tuned for 14.7afr the AP may jump from 14.1-15.1 but really the AFRs are more like 14.4-14.9...
WB02 would make life easier though...
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Custom Stage2 COBB AP, AEM CAI, DCRH, Tsudo 70mm