racer39658No, that's not the only way, it's just your way. I haven't maxxed my multiple F1 tunes because I like them the way they are. Because the available power from a "max tune" is pretty arbirtrary in GT (really, how do they decide what power bumps a given mod gives a given car?) it's a fair practice to use something like PP to create as even of a comparison as possible.
I don't trust PP because that would make a Catterham better than all of these cars and make the Gillet vertigo the best non F1/X1 car in the game and neither of those are true