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We have dyno tested many of the Superformance side pipes and they are very restrictive. We sell a complete polished stainless steel system that is louder ,but does make more power. The system includes the headers and side pipes. They are a bolt on kit with all of the hardware and gaskets.Avalible for 302,351W,460,and 427 engines. (513 ) 738-5001
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Eric H.@ Performance Engineering
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