Originally Posted by mastek
if you flip ur car ... the roof WILL collapse on you whether u have a harness or not.
if u plan on flipping ur car, get a welded full race cage .... anything else is a novelty.
My question was not actually whether the roof would collapse (partially), but rather whether the Schroth 4 point quick connect harness would keep you upright and get your spine crushed, when a regular seatbelt would allow your body to slip/tilt to one side and thus avoid permanent injury or death.
I think this has been the big question ever since they came up with this plug-in harness. I haven't received a satisfactory answer yet which is why I've never bought one for the E36 or E46.
But after tracking my E90 I realized that the only significant risk increase comes from bigger straightline speeds - cornering speeds are similar to previous cars. So as long as I stay on street or street-legal tires and as long as I don't chase the last 10-20mph on the straight, I think I should be ok.