Here’s what I would suggest you need to know. With regards to “Tuners”, years ago it was the best that most could do to enhance the ignition timing, fuel curve, transmission shift points, etc. It is important to verify the “Tuner” is ASE certified in ECM & Trans
programming & current. Plenty of persons advertise their programs to be the best & offer custom tunes, but very few have credentials in these areas. Some of these “geniuses” have caused damage to a few vehicles- just jump over to flatratetech.com & read comments from the MSE techs!