I learned a valuable lesson from a freind of mine who had hit the guard rail just pass the finish at the old Speed World track in AZ, he popped a freeze plug out of the back of the passenger side head at 175 MPH and did a hard left turn into the left guradrail and then across to the other side and then endowing and flipping the car several times before it stop. He had tighten the harness up as tight as he could before doing the burn out and he walked away from that with no broken bones or torn muscles or ligaments I now try(since 1997) to make sure and do the same thing before every run
Bill Bagshaw told me the same thing about being bruise and having very sore crotch from one of his crashes at speeds back in the 1970 and 1980s, always tighten all the restraining straps holding you in the car so you can't be toss forwards or sideways into the straps, you want to stay in the harnesses and let them hold you in place, not slipping, sliding and bouncing around in them