Selection Guide

 

Grade Performance Level Suitable for Base Material Alloy added Heat Treat Vane Friction surface machining
HP High performance Street driving and weekend racing Gray iron Yes No Straight Drilled + Slotted; Slotted only
UP Ultra performance Track racing Gray iron Yes Yes Curved Slotted only
XP Extreme performance Extreme club racing (SCCA) Compacted Graphite Iron (CGI) Yes Yes Varies (per rule) Plain fine cross cut only per SCCA rule-No modification

 

High Performance Ultra Performance Extreme Performance