I have personally installed 3 of these kits on R33's and apart from the clamps all were perfect fits.
With the right tools I am capable of installing them in 2-3 hours depending on how lazy i am.
It is very easy to install these kits.
Cutting the fan blades is a must on even the origional Hybrid Kits which i have also installed and purchased.
Minimal effect and heat difference is noticed.
Consider that the intake temperature is 20 degree's less.