SM is a geat all time tool.
If you are into racing-tuning and have a laptop, turbolink and direct scan are better.
To tune with SM you use your 02s and watch for knock.
790-820 02s at WOT. Less that 3 degree of knock with pump gas.
SM is set to read 02s & knock at the same time.
You also can read
int, blm, temps. mph, cc, mal codes. rpm
Read this link
http://www.geocities.com/rad87gn/tech/tech.html