Posted this a while back over at WSC. Figured I should give it a home here as well.
Email tunes are sometimes necessary because there is no nearby shops that can provide the service. However, to maximize your chance of a successful tune, wideband AFR is a crucial piece of data that should be collected.
The following is an example of an Email tune that did not perform to what the parts were capable of. One of the contributing cause is the lack of AFR data.
Background info on the car:
-Email tune for Accessport