667 - GTP/GS/SS supercharged with stock 3.8" pulley (67 1/4" -1708mm)
658 - GTP/GS/SS supercharged with 3.2 - 3.5" pulley (66 3/8" - 1687mm)
650 - GTP/GS/SS supercharged with 2.9 - 3.1" pulley
645 - GTP/GS/SS supercharged with 2.6 - 2.8" pulley