Associated SC10 FT on 4s lipo

This is my Associated SC10FT truck..for a small test i mounted a 4500mah 4s Lipo in the car, that already have a fast motor..the Mamba6900 (new model) and a MMP esc..the Whistle sound that ya hear on trottle is slipper spinning...(2 times Diff noice).. in the middle, trottling by the red car, ya can hear that there is a amount of sand on the car...:D (Sorry Foppa)

Hit me for some 4s Youtube action