Originally Posted by 1cleanZ

You clearly have never autocrossed or been on a short road course. You are correct, a harness bar will not help crush points when "rolling your car", but its not meant to. Its about securing you in your seat from sliding back and forth, allowing you to gain FULL COMPLETE focus on the road itself vs constantly readjusting yourself in your seat. It also helps distribute the stress on your body vs having 1 belt taking all of the force, you have 2.

A harness is day and night vs an OEM seat belt. I autocross routinely almost every weekend of the summer, and when not autocrossing I'm at a road course event. I have go-pro vids of my oem belt vs my harness mounted behind me as well as on my helmet itself(went 3 years with an OEM belt before finally doing a harness w/ belt).

There's no way of getting around your knee bruises from the door/inner pillar besides knee pads, but watching your shoulders/head shift limitations from OEM to a harness isn't even funny. The amount of focus you can retain on the course is literally day and night. I knew within the first 30 seconds that my harness and bar was easily one of my top add-ons for the track.

The harness bar is the added support you need to safely/correctly mount a hardness belt. Also, the hardness bar allows you to still retain your OEM belts,