There are different ways to end up with different results. Look at the voltage shape of the typical narrow band o2 sensor. You may be able to get you block learn dialed in and its fine for that, but what about your WOT mixture that's not suppose to be Stoic?? After all you have put into you project do you really want to skimp with $160 and a few wires to log the data? If money is that tight, sell it on craiglist when you are done. No one will ever say a narrow band is superior for tuning, you may be able to "get by" but really for the money involved, why? I did not want to bother with mounting a gauge or cutting holes so the new AEM line has one that just data logs to a computer. The accuracy is very close to the big $$ Haltech setup on my chassis dyno.
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