Or, $200 for a flashable SMEC or SBEC...
MP Tune also has a feature to allow you to input logged A/F data to tune the Pumping Efficiency table. It's not well used or documented yet, but it's there.As far as I can see, the "self tuning" just change the a/f ratio to close to what you ask it to be. It really doesn't do the job as good as I thought it would.