This is my Lego car that I made a few years ago. I don’t have a part list so please follow the pictures carefully thanks.
For step 9 you need to make two of these 45 degree slops with 1 4X1 piece contenting them. Then put them on the body of the car shown in the next picture.
For step 11 forget the arrow in the first picture.
For step 12 make two of this piece as shown in the first picture.
For Step 13 your Lego car should look like this.