I have decided to keep my FIST and most likely sell my 2018 Mustang GT. With that being said I am proceeding with mods. I already have a MBRP CAT back, so going to do the Cobb App tune, drop in filter, Catted Down Pipe and larger intercooler. I was going to buy everything and install at the same time. I am very skilled at mechanical work and plan on installing these myself at home in my garage. Should I install one item at a time and run the car first, make sure there are no issues or CEL before I go to the next one or do all at once? Is there a high risk of CEL with these mods? Will the Cobb App tell me the CEL or do I also need an ODB2 reader?