The White's V3 requires a V rated coil because of the 22.5k Hz frequency. A standard coil for the MXT or DFX will work on the V3 but you cannot run boost and it may not work with the 22.5k Hz. I know that some coils that are not V rated will work fine on the V3. Some won't, and I don't understand why. They are all built the same. Do you suppose the reason for this is just that they are nulled a bit better? And then there is the V rated coils. Are they nulled a bit better than the standard coils? Anyone have any ideas on this?