ORIGINAL: gaRCfield
Is there a difference in the needle valve? They talk about a limiter with the Nexstar ARF - is that just the plastic 'cap'?
The "plastic cap" is the limiter on the FXI.
I have 4-.46 Ax, 2-.46 Fx, 1-.46FS and the .46 FXi. All are great running motors with the power edge going to the FX, followed closely by the AX and FS with the FXi having the least power of the bunch but still pretty good.
Curt