Lol i had a 4k that had a big cam, etc, had it swapped for a heavily worked 4k (bored out to 1.5l plus the works) revved to 10,000 rpm and made 72 rwkw on the dyno, had a nice even torque curve too. not too peaky. after that i had a 5k with similar mods, tho i couldnt rev it as hard cause of the stock valvetrain. if it revved better might have made more power.