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Message: <blockquote data-quote="QIKGTS" data-source="post: 3055" data-attributes="member: 8149">I'm no math guru but I have to wonder, what percentage of the total exhaust gas flowing through the pipe actually touches the circumference of the pipe to begin with? Is that percentage really enough to slow down flow and lessen power? Would the gain by going to the single pipe be far overshadowed by the losses seen as soon as the exhaust hits the header a few feet before it reaches the "optimum 6" collector"? I would think that's the real cork in this if I'm following the friction thought process right...How about not using a header at all and just putting a velocity stack on each exhaust port that dumps into a common plenum then plumb the 2 plenums (one for the left side and one for the right side) to one big pipe. You really have piqued my curiosity here because if there is actually anything to gain from lessening the friction, I gotta believe that Pro Stock engine builders or the OEM's would have found this a long time ago.... After all, those guys spend millions of dollars combined to find really small gains in efficiency and power production... Sum it up for us in a nutshell here: How much more power is this single pipe set up going to net you on your combo (which by the way, we don't even know what it is going to be) versus standard duals?Don't get me wrong, perhaps you're on to something (that the aftermarket would be interested in adopting). Enthusiasts have no problem cutting up hoods for blowers and fenders for slicks. Why not the cut the floor for a collector if you can get a gain that makes it worth doing? I know drag racers that would have no issues at all cutting a hole to make it fit. Do you have the ability to model the flow and tell us the results? I'd love to see if the common exhaust/velocity stack/ plenum deal would make more power than a common header when dumped into a big ol' sewer pipe....</blockquote>