I have bought a carrera digital 143 set and also some accessories such as, 3 digital 2.4 GHz wireless controller, 6 slot cars and digital lap counter. Originally I want to use d132 but limited space then choose d143. However, is it any way I can run or setup or modify my d143 in order to be able to run 6 cars (instead of only 3 cars) simultaneously? Thanks.