I've been running lipos in my tc4 since 2010 or so, and they make the tc4 competitive by dropping the weight down enough to make minimum weight. You will need to select your packs carefully though(usually under 240grams) to make weight... The kit also runs best with the sweep stc6 ultra lightweight body, and gold swaybars f&r, on crc black carpet, but the best investment is in a wider foam bumper....