According to the research there is 30% of header.
Nobody knows, but the problem is a concerning one. Many soccer players have been shown to have sustained concussions, especially from repeated 'headers', and concussions (even mild ones) have been shown to be precursors, sometimes, for TBI (traumatic brain injury).
100% soccer/ football ROCKS!
30%
In soccer the percentage is 27% and in tennis it is 20%
About .02
30%
There is over 6 billion people that play soccer so I think that it is 91% of the 6,588,348,576 people play soccer.
Borla headers are by far the best aftermarket headers available for performance cars and trucks.
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10percent
all engines have exhaust headers but the headers your thinking of are aftermarket performance headers, the ones on the 440 from the factory are made of cast iron.
Proper headers will weigh between 12 pounds to 35 pounds for a small set of V8 headers