I am running the 103 kit and it is a nice package.
If you have the mag the 103 kit willl be a huge power increase for you.
My 28' single step Powerquest Silencer went from a 65 mph boat to a 73-74 mph boat, all gps speeds.
There is still speed to be had with prop work, just havent gotten there yet.
Installed CMI Etops this past summer but did not have a chance to finish the set up as I had cracked 2 pistons- serious overheat the first day with my new boat due to lack of knowledge on my part.
The kit is everything Raylar claims.