No one does that. There is no way... Remember all engines are now also somewhat broken in at factory which makes them much more tolerant than in the past. I would say that technically speaking you can go to 7000 RPM from day one as long as you don't do it all the time.
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Red 2010 370Z Roadster: Stillen G3, Stillen Exhaust, Up-Rev Tune (312 RWHP), Eibach Pro Springs, 20mm spacers front and back, Rear Camber Kit, Tinted Windows, GT-R Start Button, Interior Mods
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