I’m running IS38 plus HPFP on E50, haven’t dynoed yet, but I’m close to 400 ft/lb so I was thinking stage 2 would hold more and would be better. Just concerned about drivability, but I keep it in manual mode 95% of the time.
I had some drivability issues initially but after contacting ED about revised tunes I saw on FB, the files below were made available for my car. You can flash stage 2 or stage 1 and see which works for you. If these exact files don't work for your car, I'm sure he would upload file that would work. It can be subjective but both of these are great on my daily commute.