Something

! /bin/bash

[ -z "$1" ] && exit 1
[ ! -d "$1" ] && exit 1

mkdir -p $1/drivers/human/tracks/b-speedway 2>/dev/null
if [ ! -e  $1/drivers/human/tracks/b-speedway/car-porsche-gt1.xml ] || [ drivers/human/tracks/b-speedway/car-porsche-gt1.xml -nt $1/drivers/human/tracks/b-speedway/car-porsche-gt1.xml ]
then
    if [ -e $1/drivers/human/tracks/b-speedway/car-porsche-gt1.xml ]
    then
        echo "Saving $1/drivers/human/tracks/b-speedway/car-porsche-gt1.xml to $1/drivers/human/tracks/b-speedway/car-porsche-gt1.xml.old"
        cp -f $1/drivers/human/tracks/b-speedway/car-porsche-gt1.xml $1/drivers/human/tracks/b-speedway/car-porsche-gt1.xml.old
    fi
    cp -f drivers/human/tracks/b-speedway/car-porsche-gt1.xml $1/drivers/human/tracks/b-speedway/car-porsche-gt1.xml
    chmod 640 $1/drivers/human/tracks/b-speedway/car-porsche-gt1.xml
fi
mkdir -p $1/drivers/human/tracks/dirt-1 2>/dev/null