what would be the difference on a tune with the above fuel grades, I am a little confused and I would like to find out before I proceed with mi tune.
Please share you knowledge and experiences they will be appreciated

 

Does you Borla exhaust have cats or not? If so are the cats right next to the turbo? If yes EGTs are your enemy and a 93/100 tune won't give you much more power than a 91 tune unfortunately. Ditch the cats and you will significantly enhance tuning opportunities.

 

If I stand corrected, the Borla exhaust for the 997tt is catless. It has flex joints where the cats would be hence why I think many are thinking it is a carted exhaust.

 

The E85 tune is different due to the higher fuel requirements. On the flip side, you can get a 91 tune and run any octane 91 or above without having to change your map (verify this with your tuner).

I know with my extensive mods and a 91 tune, my car runs great with 100 octane and definitely has more power. I have an EPL custom tune and talked to both EPL and the tuner to verify this, and both said it will only run better with higher octane fuel.

 

No cats.....

 

I removed the flex pipes for a better sound....

 

So of you do a 91 octane tune you can run higher octane fuel ?