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Nice job, they sure LOOK like they'd make a significant, positive difference in FE. The improvement in flow is so obvious that the lack of a clear, positive FE test result is very surprising.
The fact that the FE is unchanged, plus the extra noise, makes the pretty flow pattern pretty unimportant for everyday use. I guess I'd leave them off, or retry the FE tests at a higher speed to confirm the non-improvement.
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