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depending upon how much power you are pushing. At least, that's what the experts say. I tried not to delve too much into it since I don't know the proper terminology, but I *DID* gather the end result and as backwards as it seemed, it made sense. It has to do with taking the size of what comes out of the turbo and realizing that going from a small hole to a much larger one can actually cause more problems in flow than good. I don't know if turbulence is the right word, but something about having a stream of extremely hot air shooting into a larger area where it expands, spins around a bit and then makes its way out is less efficient than it being FORCED out rapidly by a steady sized pipe. Crap, I wish I could just call up someone and have them type this out...but I *KNOW* there are people on this board that know science behind it...that is, unless they are scared to open their mouths because it's "different" thinking. To give you the simplest of examples, I've seen a back to back dyno with 3" downpipes and 3" testpipes that was less impressive than the 2.5" DP/TPs that went on next, even after being heatsoaked. Better powerband and if memory servers, the same horsepower (though the huge difference in spoolup and the band made even a few horsepower difference irrelevant). Of course, that's one example...I'm just trying to show that sometimes the obvious, isn't.
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