i only tested the 4x2 layout car in my garden where i was a lot faster than i was with my bx. gary (xx4-nutter) helped me test the car which i made out of 2mm alliminuim ( this is for the prototypes only as it is cheap...free from my uncles work, lol) he said he was quicker with the car than he was normaly with the xxx4. i spoke to phil truman who also did something very similar which he said was an amazing car and he also gave me a few ideas and how i could improve mine