Electric Losi 8 buggy weight?

I realy don't know how you can build a brushless buggy under 8 pounds.
My Mugen MBX5, with Neu 1515 1Y, MGM 16018 and a flightpower 5000mAh, 4s is at 8.6 pounds and i can't go down

My kyosho 7.5 Conversion is 7.7 pounds with a 1515 1y/f motor and 2 2s Neu 5000 Mah packs

Hey???? it's 1 pound less than mine, 1 pound, it's the weight of the li-po pack!!!!
And roling, the MP7.5 and mugen is about the same weight.
the only way for me to go under 8 pounds is to remove the motor!!!