I think there's two 3" Z exhausts. GTM and FI. Fast Intentions sells a 3" exhaust with cats. 3" exhausts are for turboed cars. 2.5" is far more common because that's a good diameter for NA cars, and most people leave their Zs NA. Most people don't run cats on their turboed Z, leading to few people making 3" HFCs.
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2011 MB Touring-Sport-6sp-Nav/GTM TT/FI TT TDX/JTran/Kosmic/Eibach/Hotchkis/SPC/CSF/RPS/SoThatsWhereAllMyMoneyWent
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