About 20mph +
The C5 Z06 will pull 6600rpm in 5th gear, 173/4/5mph, 6th gear is an over drive and you lose speed.
The C6 Z06 with 100 more HP will surely pull 7000rpm in 5th gear (which is a little taller - as the C6 Z supposedly receives the slightly higher ratio (the "normal" 6 speed ratios) transmission.
Combine the 7000rpm redline and the slightly taller gearing (same rear end ratio) will surely run mid 190 mph.
Every 500hp C5 (modded cars) already pulls mid 190mph in 5th gear.
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