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Message: <blockquote data-quote="Burninrock24" data-source="post: 1278967" data-attributes="member: 18179">Juicy info:  "H-pipe technology, which does work, that it does equalize the  pulses, but it doesnâ€™t really help the scavenging effect so much because  what happens is it will equalize it from side to side from a typical  V-type engine, but it doesnâ€™t exactly draw all the gases and force the  pulses to work off of one another in the end to really improve exhaust  flow. " - Source: <a href="http://www.onallcylinders.com/2012/08/14/video-exhaust-x-pipes-vs-h-pipes/" target="_blank">http://www.onallcylinders.com/2012/08/14/video-exhaust-x-pipes-vs-h-pipes/</a>This one has the x-pipe paired with a 3" catback, so it's not exactly an equal comparison, but at 300rwhp the difference between a 2.5" and 3" is negligible. A motor with that power can't produce the CFM to make a 2.5" a restrictive pipe. Here: <a href="http://www.carcraft.com/techarticles/exhaust_system_installation/" target="_blank">http://www.carcraft.com/techarticles/exhaust_system_installation/</a>Here is a video of a guy demonstrating the scavenging effect of the X pipe in his garage with an air compressor firing through one bank and showing the suction on the other bank. <a href="http://www.youtube.com/watch?v=yMyKv_P80eI" target="_blank">http://www.youtube.com/watch?v=yMyKv_P80eI</a>Then books I own and that you should read! Lots of these are at your local library. Practical Gas Fow: Techniques for Low-Budget Performance Tuning by John Dalton  <a href="http://www.amazon.com/Practical-Gas-Flow-John-Dalton/dp/1855205645" target="_blank">http://www.amazon.com/Practical-Gas-Flow-John-Dalton/dp/1855205645</a>Chassis Engineering by Herb Adams: <a href="http://www.amazon.com/Chassis-Engineering-Building-Performance-Handling/dp/1557880557" target="_blank">http://www.amazon.com/Chassis-Engineering-Building-Performance-Handling/dp/1557880557</a>How to Build Horsepower by David Vizard: <a href="http://www.amazon.com/David-Vizards-Build-Horsepower-Design/dp/1934709174" target="_blank">http://www.amazon.com/David-Vizards-Build-Horsepower-Design/dp/1934709174</a>How to Build Max-Performance 4.6 Liter Ford Engines by Sean Hyland: <a href="http://www.amazon.com/Build-Max-Performance-4-6-Liter-Ford-Engines/dp/1613250819" target="_blank">http://www.amazon.com/Build-Max-Performance-4-6-Liter-Ford-Engines/dp/1613250819</a>How to Port and Flow Test Cylinder Heads by David Vizard: <a href="http://www.amazon.com/David-Vizards-Cylinder-Heads-Design/dp/1934709646" target="_blank">http://www.amazon.com/David-Vizards-Cylinder-Heads-Design/dp/1934709646</a>Then this is literally the best free racing and quick reference suspension tuning guide you could ever want. So great. <a href="http://farnorthracing.com/autocross_secrets.html" target="_blank">http://farnorthracing.com/autocross_secrets.html</a>There is some really fun stuff we were researching with pipe organ tuning and it's auto applications. Where adjusting pipe length can help promote the fastest exhaust escape velocities at a certain RPM. Based on the frequencies of the cylinder firings and their relation to standing waves in pipe organs. I'll dig up some of that info if you want it!</blockquote>