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Quick measurements:
external diameter, stock header 29mm
external diameter, aftermarket header 31mm
Stock has a crossover, aftermarket doesnt. The routing is completely different. Should you expect exactly the same result? No. Will your plan produce more power than stock? Only a dyno will be sure.
My stock system wasn't weighed in pieces, so I don't know how it compares to the 281g (right) and 299g (left) of my aftermarket header pipes.
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If another thread is linked or quoted, go read it yourself.
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