i had a buddy who put these on his F4i and they sucked very flat profile slipped on any wet surface. and just felt like crap through a turn. very hard turn in and nervous feeling while leaned over. he asked what he all needed for a track day and i told him tires. he didn't understand since he just put them on.. i told hime i wouldn't take him to the track unless he changed becausei didn't want to have my day cut short on him crashing and me haveing to go to the hospital..