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Although sceptical I tried Hiclone because it came with a money back guarantee. First 1, then 2. Identical long trips driven with no measured change in fuel economy and no noticeable change in power.
Might be something to do with the air having to flow thru the throttle body, plenum, intake runners, VICS butterflies before it gets to the injectors?
Food for thought: aircraft companies pay careful attention to wing tip design to REDUCE swirling. Why? Because it takes energy to stir up those wing tip vortices (sometimes visible on humid days). Where does that energy come from? The engines!
So any benefit from better combustion needs to overcome the work done in changing the aiflow's direction. In some cars it might, but not mine.
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2002 Mazda 323 Astina 2.5 V6 manual.
KL-ZE 2.5 V6 with stock intake, stock headers, Magnaflow cat, custom midpipe with extra 12inch hotdog, Racing Beat catback.
BC Racing coilover kit, Mazdaspeed 25mm front stabiliser, Progress 22mm rear stabiliser, GTSpec front and rear strut tower braces.
Enkei RPF1 15x7, Yokohama Advan Neova AD08 205/50 R15, RDA slotted rotors, HPX pads.
SOLD  
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