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:I mean what is the benefit of this versus just stepping the piping down to the flange on the turbo? What was the recorded gain between the V1 and V1 inlet systems or was the results never completed. Last i heard it was right there and then injector failure? Matt When you're talking air flow, the idea is to keep the I.D. of the piping as big as you can as long as you can. That's why it would be better to have the step in the picture I showed rather than tapering all the way to the outside edge of the flange. However, the 2.5" piping makes large gains compared to the stock 2" piping because there are 18' of 2.37" I.D. tube. The differences that it would make tapering from that lip to the outside edge of the flange you wouldn't even pick up on a flow bench. It's easier and more beneficial (Whatever SMALL amount that may be) to do it the way Ash has. The only change he will be making is to taper down to the face of the compressor wheel. However, Ash did say that it is a little bit hairy getting that close to the compressor wheel because all it takes is to be off by a few thousandths, and the housing is trashed. When he does this to the stock housing I will take pictures and post them up to show a before and after.
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