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for racing u need the red key easily accessable

full on track cars have like a choke cable to pull on the red key from outside the car and also u need stickers showing where the switch and battery is

i have the double swithc battery keys but theyre not cheap

new efi engines usually wont turn of with a basic battery key
thats y they invented the double switching type

if the key is in boot then u need to leave the boot unlocked or key in the boot lock when racing

but at end of day depending on what class u race will depend what u need to do eventually if u get too serious in racing your car becomes more a race car and less a road car due to racing rules and regulations and also depending how serious u want to win