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if the probe is in the exhaust post-cats then I've read that it will read a bit lean compared to actual products of combustion pre-cats (which is where the ecu gathers its data from) so your actual afr might be where it is supposed to be.
remember, regardless of what you have done to improve airflow (larger airbox, bigger plenum, bigger throttle body, better exhaust) the air still has to flow by the maf and be measured, and the computer just adds fuel based on the amount of air measured. so, as long as you are measuring air properly (ie, proper diameter maf housing) then things should be pretty much ok.
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