When I worked at a stereo shop 3 years ago I was delevering a customers car that was a Auto convertable Z24 and one of the guys that worked at the shop was folling me in his 00' civic Si that had some bolt-ons.

Short story shorter, he barely pulled on the bone stock auto, convertable Z24...

I'd bet a manual hard top Z24 would have bet him...

 

yeah, manual coupes are about .7 to 1 full second faster stock. most bone stock 5 speeds run a mid 15. some lower.