I have a 17 2.0 AWD. Got a Livernois tune. Just loaded the 89 octane boost last night. It has 87, 89, 91 and 93 tunes. I figured I'd try in stages. Haven't been able to open it up yet. Yesterday I drove home in bumper to bumper traffic and I could feel a noticeable difference but couldn't get enough space on the road to really play. I'll keep you posted.