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One of the questions I have is expected power gains from fitting them over factory headers. Obviously you have done some testing as your site claims excellent power increases. While it is somewhat difficult to compare gains on one car with one brand to another car with a different brand - your results will provide a guide.
Ballangers and Hennessey headers have both regulalry reported 35hp gains + combined with high flow systems from the header back. How do yours sit power gain wise?
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