You can do a custom search (top left of the page) before you ask a question.
Almost anything efficiency related has long been discussed and tested over here, so searching it out first helps preventing tons of threads about the same thing.
No, cold air intakes are generally bad for efficiency. Instead we fabricate our own hot air intakes or use grill blocks, which tend to raise under hood temperatures which also increases air intake temperature.
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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 Gigameter or 0.13 Megamile.
For confirmation go to people just like you.
For education go to people unlike yourself.
Last edited by RedDevil; 03-29-2019 at 07:48 AM..
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