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Do you drive your Boxster on the street at redline all the time, or do you use the entire rev range? Personally, I rarely ever go near redline when driving on the street in my car.
What BY is saying is that you want headers that will work over the expected rev range. Most people aren't flogging their cars at redline on the street, so the headers should be tuned to work well from 2K to 7K. You can tune an exhaust to make maximum power at redline, but then the car won't have much torque and will be a dog to drive in a normal manner.
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