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I always remove the narrowband, delete the O2 from the ECU and strictly run wideband and tune by wideband.
You can tell on the wideband based on how it acts whether there is any exhaust leaking.
That is, you can tell on GOOD widebands, like AEM's versions. The Innovative I can't use for shit, its awful, the ADC is the problem, as they both use the same sensor. I have customers that buy the innovative without asking me, then I tried to use it anyways, god #@(*@# terrible, they didn't know and it happens every so often.
Its a good idea to test for exhaust leaks but honestly, depending on the customization of the system, the placement of the O2 sensor and exhaust manifold gasket-mating is extremely important while the minor leaks at V-bands further down the system after the exhaust temp has cooled are negligible and almost impossible to fix without replacing the clamps or changing the hangers or angles of incidence on some cars. The wideband needs to be a few feet away from the turbine for EGT reasons but not much farther.
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