You did have two flow meters the second one on return line?
Conserning crash safety the law book is about 35-50mm thick. So there are lots of points your design does not meet. I would also estimate your leg bone will break at higher speed impact as force is distributed to smaller surface area. On that point its not safer pedestrian collision at least for adults.
However usually police or MOT inspection dont care if there are no sharp corners on the bumber. You can always sell them for offroad use to avoid that. I dont know any tuning bumber sold that is tested...
I had a similar design in my Seat and it worker perfectly at high speed driving. That is not the optimum shape but its only 1% worse than round nose and gives stability at higher speeds.
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