Find a Tuner you are happy with is essential & then take his advice. 20 years ago I was hunting for a Tuner.
Went to a well known one back in the day, immaculate workshop, comfortable seats to discuss my aims even a view window to see the work being carried out. They were well advertised but didn't impress me one bit. Next port of call was a single garage that looked like a bomb site within minutes he was my Tuner such was my first impression. 20 years later nothing happens to my car unless that Tuner agrees. You need to find the same & it may not be the ones that are advertised everywhere. Best of luck finding someone you can trust.