Hey guys, bran new to the forum. Heres my question, I have a 2008 3500 with a 6.7. I bought it used, with a DPF delete already completed. But the tuner it was done with was nowhere to be found. I am looking at doing an EGR delete right now. Now the questions.

I want to use a Smarty Jr. (open to other suggestions)

I am looking at one of the combos that has the tuner and the EGR kit included. I need to know wich model will work for me.

I need to know if I need to have the computer set back to stock before I install the new tuner, and if i need the original tuner to do so.

Any help would be greatly appreciated, like I said, Im a newbie, so sorry about the amatuer lingo. Thanks.