Finaly a tutorial for REW that is concentrated on tuning a car. As mentioned in the video, here are some links to other usefull videos:
How to make your first measurement with REW - https://youtu.be/EeJ22x_z3LI
How I EQ my system - https://youtu.be/DK8RmZQZtu0
REW RTA FFT settings - https://youtu.be/8LUqT4BzsWA