[Serum]

The 7XL would be quite a preformer allready.. though with a cell limit of 12, you need the best cells you can get! it's more about the power of the cells with these low amount of cells. . the 7XL get's my personall vote, because i like a bigger motor with a lower kv over a smaller motor reving at those nervous high rpm's..

With a 5 minutes race, you should be fine with the 7XL