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Use some air intake measuring device to ensure the air intake and general under hood temperature does not get out of hand.
When I removed the snorkel combined with a lower grill block it rose to above 50 degrees Celsius (128 Fahrenheid) and I saw the instant economy drop. But my car has EGR; some cars without EGR seem to tolerate much higher intake temps to good benefit.
The grill block causes less fluctuations than the snorkel delete, so my snorkel is back on to stay there.
Before I had my UltraGauge I used a cheap digital in/out thermometer with the out feeler in the airbox. Worked fine except I could not read it at night.
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2011 Honda Insight + HID, LEDs, tiny PV panel, extra brake pad return springs, neutral wheel alignment, 44/42 PSI (air), PHEV light (inop), tightened wheel nut.
  lifetime FE over 0.2 Gmeter or 0.13 Mmile.
For confirmation go to people just like you.
For education go to people unlike yourself.
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