Not sure is this is a relative question but I'm wanting to use both on my 09 Hemi Overland. The Sonnax Trans pressure booster and the Superchips flash. I read that the Superchips made changes to the Transmission to firm up shifts but did not know if it boosted line pressure too. Don't want to over do it!
I dont know about superchips, but a few of us have run the sonnax with predator canned tunes and havent had problems. I have since moved up to a custom trans tune, and cant use it anymore.