Originally Posted by sensi09

Break in period is overrated. I do believe it takes a little time until the brakes, clutch and tires are optimal, but I don't buy not revving past 4K.

Some actually advise on running the car hard to redline right away as it may yield more power and be healthier for the engine in the long run. Break In Secrets--How To Break In New Motorcycle and Car Engines For More Power

There is also some speculation, that break-in periods still exist to allow the new owner to get accustomed to the car which protects the car company legally.