I REALLY wish you could get a performance tire in 15".
You can, but they aren't cheap. Z rated Avons. Around $300 a tire.
Otherwise is H rated MT SR and Maxxis Marauduers around $150 ea.
First i've heard ov these now? But still... BOOOO! Why always the compromises??? Who the hell wants 'period' performance...??? There are modern Vettes and Mustangs in the canyon... Cant win. Cant even come close to winning.