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It also depends on which gas you believe is worse, C02, CO, SulfurDioxide....
They all have bad effects... Pick your poison.
Matrix Full metal cats actually help exhaust flow at street speeds.
They make the exhaust laminar in the pipe, flows better.
Cats don't last on race cars, the sustained exhaust flow at race RPM melts them.
Dave
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If it has a motor its worth playing with.......
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