YES the C5Z comes only in whats refered to as FRC (Fixed Roof Coupe) What you probably saw was a regular C5 FRC non Z06
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imho...i love the c6 much more then the c5..and c5z06....i have been able to drive a 01 c5..a 07 c6 vert ..and a 06 c6 z06...the c6s are light years ahead on comfort...the ride and power delivery is unmatched in the c6s..the power hits smooth in the autos..and just continually pulls. nav screens and gorgeous interiors..better styling personally and then a ls2 has alot of potential in the N/A field ..BUT! the 05s are the only c6s that only have a 4 speed auto..the 06+ get that orgasm known as the 6l65e ...so imho ..look for a 06+ c6 in any model ...or if going m6..then go 05+ c6
ive had both c5z and c6z and i still think my c5z felt more raw. the c6z is obviously faster but the c5z just felt more aggressive. i still would rather have a c5z over just a c6 anyday, even the ls3 c6
the c5z has more interior room too
im a c5z fan