Thread: What is the difference between HFC and test pipe?
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Old 07-06-2010, 08:35 PM   #35 (permalink)
BOLIO 671
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Originally Posted by Westwood View Post
i was looking at the dyno sheets and test pipes have a few more hp compared to the sheet with hfc's
True..Test Pipes do produce more HP than HFC's bu not by much...and you will only see the gains at the top end
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