Yes there are two vervions of the BMI car. The orignal DB12r and the updated DB12rr. Both will fit 1c lipo just fine but the new rr can be ordered with a lipo specific main chassis that has a recessed area for the lipo to sit down into. And yes one of the other areas addressed with the newer rr car was to center the brushless motor weight/rear pod. There are a couple of other changes/differences between the two versions but those are the most talked about.