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Message: <blockquote data-quote="Devillian" data-source="post: 663837" data-attributes="member: 22102"><p>I agree cats are restrictive and that a well done header would still provide a gain. My warning was against any headers that haven't been designed with a proper R&D. A large portion of them will not provide a power gain and actually reduce the overall power and efficiency of the engine. The amount of work that actually goes into designing a proper header is a lot more tedious than most people think. It isn't like air intakes where "more flow is better". If you have too smooth a flow, at certain rpms some of the air/fuel mixture coming into the engine gets lost through the exhaust instead of staying in the cylinder.</p></blockquote><p></p>