X or H pipe
they both have benefits.to use an x pipe you really need all the room under the truck that way it is a true x.The idea of the x is to scange or create a vacum on the other pipe to help pull the gases out from the forward part of the pipe and alos to even the flow out more.The h pipe at best equalizes them and not to well either.since it has no position for flowis more likd a balance tube.The modified x as I call it like JDM and bassani use is the best for the restrictions that are under the trucks .In my case since I relocated the tank I had freedom to use the real x but its not to easy to do.Stan
HI!... Use the "X" pipe. This is my set-up.
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https://www.f150online.com/galleries...-793-37312.jpg
https://www.f150online.com/galleries...-793-29786.jpg
https://www.f150online.com/galleries...-793-37311.jpg
https://www.f150online.com/galleries...-793-37312.jpg
https://www.f150online.com/galleries...-793-29786.jpg
Everything you ever wanted to know about X and H pipes (warning to dialup users-link is to a PDF file--give it a minute): crossover tech


