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Originally Posted by Jake Raby
If those are the comparable runs I'd say that Randall's engine was making less power than a normal bone stock 2.5 to begin with.
I've never seen a gain anywhere near 9Hp with the Chinese headers, in fact I've never seen a single system enhancement make that kind of power difference on that size engine.
What really tells the story is the data logged 0-60 and 40-80 MPH tests before and after the dyno with both systems at the same coolant and oil temperatures.
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What should a healthy bone stock 2.5 be pulling?