I've tested my own designed HHO and also have used an EFIE and modified sensors...but one vehicle was carbed...the other was 4x4 and 1st year EFI. Could not claim I saw a gain.
This chip looks to be no more costly than an EFIE...and looks to also "modify the other sensors" at the same time. Fairly easy install and will work with an SG? Not sure what if any changes I would see with the SG readout though. Might try one.
Looks like the FS3 would be best...but the FS2-HHO seems to do the same thing and also adapts to HHO.
thanks
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