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an added thought on diameter of exhaust pipes.
the chart always refers to the MAX hp. So unless you are a race car you are at max hp MAYBE 1% of the cars life. Remember MAX HP is at aprox 6k rpms. how often do you hold 6000 rpms??????
The other day my scangaugeII recorded 30hp while doing 60mph at 1812 rpms. My car is rated at 340hp V8.
I certainly dont need to 'open up' the stock system to get better 'performance/mpg'
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