Im thinking about turning my 400ex into a 416ex. Im thinking about getting this. http://www.magicracing.com/product.a...=147&catid=133 Whats the difference between 11:1 compression and 10:1 compression? With this kit, do i need new valves or anything or just this? I wanna rebuild it becuase it needs a rebuild so i might as well upgrade it. Thanks