how do you tell?
 

just bought the truck. 01 sd 350 psd.

i found a sheet in the glove box pertaining to a superchip.

how do i know if ones in there and do i need to get rid of it before buying/installing an sct tuner?

thanx, chuck

Your going to have to check with the previous owner.

You could have the ecu scanned to see it its stock. Hopefully the last owner returned it to stock before he sold it

hmmmm-doesn't sound good.
can the dealership "flash" it back to normal.
but bottom line is: gotta know and clear before installing new tuner right?

chuck