I also use CG-Locks and they do keep your butt in the seat where it belongs.
I wanted to use a harness in my car until I researched the subject. After which I came to the conclusion that I would never install a harness without a ROLL BAR and harness bar. Besides spinal compression caused by incorrectly installed harnesses what if the worst happens and you roll the car. There you are strapped upright in your seat with no place to go while the roof collapses on your head.
Just food for thought.
Best wishes and keep on modding April 2009 SOTM, July 2009 ROTM, 2009 FF ROTY
RIFF CREW, Sedan Revolution #137, TEAM Duratec #181, Bremerton Raceway #658, NW POSSE #6