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are better flowing than straight downpipes. The only problem with a dyno comparison on this is that it doesn't cover the turbo response when you are shifting through the gears. Having the wastegate opening and closing and the turbulence they generate in doing this is where the split design will be noticed. On a dyno the wastegates are totally shut until peak boost is reached and then they modulate to maintain boost. Since the split downpipe design seperates the gases that want to interrupt the flow of gases coming from the turbine, they will have better on-off response as you are driving the car in an aggressive manner. This is just my take on it based on what you are saying. The real test would be to perform this comparison on the same exact car on the same day on the same dyno. Comparing with two different cars is not really gonna give you a result that you can say with absolute certainty that it is one way or another. Until someone does this, we wont know. Changing from a 3" DP to a split flange design DP wouldn't be that hard to do at the dyno provided they have a lift too (which most shops like that do). Changing between stock precats and downpipes is a whole 'nuther beast of a job to do. I would like to see that particular test done, but its well known, even by the 'ol butt dyno that they do improve spoolup characteristics.
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