Search 'look inside' for the word 'banned' to see what greg's talking about. He's right. That's cool.

What would F1 be like if they relaxed all the rules?

Edit: Just got through the chapter, the author speculates on what would be possible without bans.

I haven't read the book but I think CanAm in the 70s was pretty much racing with no engineering restrictions. Hence you had the Porsche 917 putting out 1500hp+ and only weighing 1800 lbs.