that will make your roo fly great,
I done a similar improvement to my fiber classics kangaroo quite some years ago now and it changed the performance allot..
its better to land with and also has no pitch change from low throttle to full..
I have a Jetcat P-80 in mine
the attached pics were taken at our local Mangalore Jet geez must be about 10 years ago now but I still have it today and flies awesome