Installed them this afternoon, night and day difference between the 255 and the 275 rears. I have no clue why it didn't ship from the factory with this set up. for the first time I can actually use the gas pedal without breaking them free all the time and now i actually have to try and chirp third without it doing it all the time. Car feels much more planted and balanced and handles spirited driving like it was meant to without wanting to power slide with moderate throttle. All in all in the short miles i've put on the car leaving the installer the car feels great. Off to the dealer tomorrow or friday to have the alignment checked and most likely replace the front Brembo rotors and pads.
What's funny is the road noise actually seems quieter than it was with the factory tires and the tires feel softer on bumps, kinda miss the rough, connected ride where i felt every imperfection in the road. The shifts also feel much more pronounced now and really "slam" into gear and don't spin on every upshift unless I'm slamming them at redline