i had issues with my stage 4 with 350whp it slipped pretty bad when it got hot.i did love the feel and driveability but it slipped at the track. i called them before i installed it asking what do they recomend for breaking in on a race car since you cant drive around for 500 miles and they said they dont have one that they need to be broken in. so i said i guess you dont recomend racing your clutches and they had no comment.