A turbo tC can run 10's to 14's... most people run high 13's.
And which trim C5? The lower ones are dogs. I can run faster. But if you're getting in the z's then, no, not too many tC's are going to touch a C5 z. But there are plenty turbo tC's that can beat lower trim C5's.
Aw man, I thought this was for tC's for some reason. FR-S's are all over the board. Some get very minimal gains while others are through the roof with power. These are not fast cars by any means, and will never keep up with a Corvette.