I don't think they handle well at all, but i never use my frst to rally around lanes or use on a track,my vtr handles like it's on rails and its not even lowered yet, to get a fiesta to handle and keep that amount of power down would cost a few quid, a standard erst box wouldn't hold 250bhp so that would need uprating as well, then poly throughout, adjustable front arms, coil overs, rear beam change ££££'s