Because i drive it hard Lee. On all other engines ive had its easy to tell when to change cos the Power starts to die. This Bl**dy thing has a billion horsepower everywhere & its so easy to over rev it. Dont mean to be using those revs its just through the rev range so quickly in 2nd & 3rd. On my gearing 8.9k is 98mph in 2nd & 142mph in 3rd so lots of fun to be had on the street . Its also 190mph in 4th & oh so easy to reach .