It does exactly what I bought it for
I bought this to turn off the afm on my truck and it does exactly that. I have also been able to read an engine code with it already as well and worked great. The reason for 4 stars instead of 5 is because it seems to mess with the truck electronics while installing the tune (dash lights flashing, service stabletrak), which I don't know if its normal or not but worries me, so I will just stick with the stock tune with the afm disabled. Autoanything was extremely helpful with the purchase.
I mainly got this to improve throttle response, adjust speedo, and hopefully save MPG. It has definitely increased my MPG the rest it didn%X92t help with, although I can tell it added some tourque. I will update this once I have put some custome tunes on addressing my other issues. But I%X92m happy with my purchase just with the almost 8 MPG i gained! I drive a lifted Silverado so I will always be searching for ways to save on fuel