B recliner... Im also in the process of the same actions you are taking. I plan to purchase the snr chassis. I bought a couple 2650 and 3000mah 6s and other little lightening tricks my estimate of weight savings right now is 14oz not bad!! Cant wait to get it all dialed in. I'm running this with tekin 1550kv also thinking of trying similiar 5s this motor is kind of between 5-6s I think. I've also bought a spare losi battery tray and fit that in. Its longer and makes more room to move the batt forward and back.