which nitro engine and hpi conversion

[joshuapaugh]

what is the differece between .12 and 21 and is there a conversion kit for the rs4 pro to switch it to nirto. or how can i

[Walter]

.21 is almost twice the size and power of .12.

[pp13b]

what walter said http://www.rccaraction.com/ubb/biggrin.gif


12`s have any where from .56 to 1.2 hp.
21`s have any where from 1.9 hp to 3hp.