I use 2ga on everything for the main cable. Master switch to a junction in the firewall area. Distributed from there to starter relay, switch panel, etc. Good 2ga, fine strand welding cable. Big motors, high compression, whatever. Lighter, easier to work with. Never a problem. Never an issue st the track. All the chassis guys - Bickel, RJ - sell the same thing for their stuff. Don't use a junk starter.