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So.....I don't know what suspension comes with the Z16 package, but I suspect it's the FE3 or possibly the FE4.
However.....just go out to your glove compartment and take a look at the sticker on the door - it has all the RPO codes built into your car, and I believe that even if it lists Z16 that it will probably also have FE3 (or whatever suspension you have) listed in the list.
Aha!!!! The Z51 lives on in the Z16 Grand Sport!!!
Well, sort of. We went through this in a couple threads last month. This is what we determined based on a member who modded his base C6 to GS specs with the help of Gene Culley advising on the GS part numbers:
The Grand Sport suspension is:
......Z51 springs and front sway bar
......Z06 rear sway bar (this kind of makes sense)
......Z06 front shocks
......UNIQUE rear shocks