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This is from the SCCA rulebook:
What are these kits that they are describing???Saturn Ion Redline (2004), p. 29, add to the specs as follows: Wheel size(in): 17x8
(F&R), Notes: The GM Saturn Ion Redline T2 suspension package PN XCC578 is
allowed. Kit consists of: PN XCC579 front spring (450 lbs/in), PN XCC580 rear spring
(750 lbs/in), PN XCC581 front anti-roll bar, PN XCC582 front jounce bumper, PN
XCC583 front lower control arm bushings, PN XCC584 steering gear mounting
bushings, PN XCC585 rear axle mounting bushings, PN XCC586 rear jounce bumper,
T2 Brake ducts (GM PN XCC587), T2 Aftercooler (GM PN XPI588) T2 Supercharger
pulley (GM part number XPI589). The kit must be removed in its entirety for T3
competition.