check out this link for the Sumitomo HTR Z tires and let me know what ya think!!
http://www.tirerack.com/tires/tires.jsp?tireMake=Sumitomo&tireModel=HTR+Z&partnum=05WR5HTRZ&vehicleSearch=false&fromCompare1=yes&place=11&speed_rating=H&speed_rating=V&speed_rating=Z&speed_rating=W&speed_rating=Y&speed_rating=(Y)
http://www.tirerack.com/tires/tires.jsp?tireMake=Sumitomo&tireModel=HTR+Z&partnum=05WR5HTRZ&vehicleSearch=false&fromCompare1=yes&place=11&speed_rating=H&speed_rating=V&speed_rating=Z&speed_rating=W&speed_rating=Y&speed_rating=(Y)