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Message: <blockquote data-quote="dutch" data-source="post: 513153" data-attributes="member: 11020">I'm just quoting a artical I found in Modified Mustangs from Nov '05 by Scott Hoag (founder of Mustang Racing Technologies and former team leader for the Bullitt and Mach1 mustang development at Ford)"One myth prevalent in the industry is that X-pipes flow better then H-pipes... This statement is just not true! In case you're wondering, there is an entire fluid dynamics lesson involved to support this position! Over the years, we've tested nearly every combination of X and H pipe configurations and have found that tube-diameter, catalyst selection and bend shape all contribute to performance. As long as the system is designed with a crossover between the left and right hand exhaust tube, performance will be very similar regardless of X or H configuration."discuss. :thumbsup:</blockquote>