Thanks all for the responses
I see I need to give more info...
My current setup is all stock - I have the 17x7.5 wheel with stock Michellin Primacy tires (215) and have big Brembos and Sachs Dampers (which are stock but got them thru the upgraded sport package at Subaru).
I want to get the Hankook Ventus RS4's and add some camber for next season, but was wondering if I should also get the bigger wheel to fit more rubber. This car is basically only for the track, except for running errands (in the sense that I don't need a daily driver because I work from home).
I've only been to the track 3 times now at Cayuga, so I am still new and learning - but I do feel that I could benefit from some more grip - here's a vid of me at the track - I get between 1:30 and 1:33 on the track typically.