I have a 98 civic 1.6L and a 1.8L both automatic. Also i have a 99 accord vtec 2.3L 5 speed. Was wondering which would be fastest in low or 1st gear. Also what modifications would help go faster on a 500 ft. Tire to tire dirt circle track. Headers ( idk which would be best)and intakes seem to be popular. Should i chip factory ecu, or get a v tec controller' fuel rails or injectors, high pressure fuel pump plugs wires etc... ?????