Whatever harness you purchase, make sure its designed to work with factory seats. You have to specifically see a mention of that on the box or in the literature and see some kind of DOT certification.
Why?
Spinal compression and/or the shoulder straps popping off your shoulders in an accident.
Racing harnesses are designed to:
1. Have the shoulder straps mounted horizontally from the tops of your shoulders to a roll cage. If the straps are installed at a downward angle greater than 15 degrees the straps will compress your spine in a frontal collision.
2. Have the shoulder straps run through reinforced holes in the upper seatback of a race seat. These holes prevent the straps from popping off your shoulders as your body flies forward in a frontal impact. The headrest mounting bars are not strong enough to do this job. Sternum and H straps are now being outlawed by some sanctioning bodies because they don't allow the chest to flex in a big accident, causing heart bruising.
Unfortunately, just bolting in a set of racing harnesses can increase your risk of injury or death and your insurnace company will walk away from their coverage if the harnesses contributed to your injuries.
