You may just need to add some WOT fuel. I had a 5.7 chip and then went with Champion irons. I just added top gear fuel as I tested at the track. Driving around town etc it wont be any different.
Agree with BeatAV8 on the GNECU. By the time you buy all of the other stuff you are close to what the GNECU costs and the wiring is much cleaner with the GNECU. And add in the Scanmaster G. For the suspension start off with the HR rear sway bar for starters. It makes a big difference in ride and...