I know the front WS6 sway bar is hollow, I think it is bigger also. Not sure what size came on the Z28 but my WS6 was 35MM front (hollow) 21MM rear (solid). There is actually a pretty significant weight difference just from feeling my Spohn solid front bar, I'd say at least 3-4 pounds.
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-Nick
9/11/01- Never Forget
2002 Pontiac Trans-Am WS6 # 206
Chasing 10's
469RWH/437RWTQ
11.05 @ 123
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