I say just go ahead and keep all the FT Carbon stuff on there and if you need to add weight, use stick-on wheel weights from 1:1 cars. That way you can add the weight where you need/want it and can control the weight in 1/4 oz.(7 gram) increments for the most part. I had to install 1 1/2 oz of weight to my B4 to get it past tech with a stock motor and reedy 3200mAh LiPo. The awesome thing was that I could add the weight just under the rear shock tower and under the front upper plate. It handles rough stuff well and has tons of steering. Just my $0.02.