Nova, I use the High-Power setup and it performs well. Use a 60 A ESC and the recommended Delta-V 480 4800KVA EDF and the TP 2600Mah battery. You may be able to send in the old motor and get the Delta-V 480 4000KVa motor but that will not work well, you need the 4800. This link has the info:
http://www.e-fliterc.com/Products/Re...Fan%20Set%20Up
Since you have the original unit you will need to relocate the front wheel servo so you will need to cut a small block of foam from the shipping box wall to mount the servo. The instructions for installing the new motor are very well written in the new manual you will find in the link below. There is no info on making the block but once you look at the manual you will see what I mean. Be careful when cutting open the access door, only cut in about 1/4 inch on the sides.
http://www.e-fliterc.com/ProdInfo/Fi...400_DF_ARF.pdf
Enjoy!
-40+