I installed manual compression releases in my 09 with 103 with SE 255 cams a few weeks ago what a difference. So much better now. If you're running 255's in a 103 without releases get them you will be much happier. Other than the machine work it can be done at home with manual a good set of hand tools and a couple torque wrenches. You will also need a couple torque wrench adapters for the rocker boxes and rocker arms. I purchased mine from McMaster-Carr industry supplie. For something like $35.