Has anyone used one of these?
Does it work or is it "Snake Oil" ?

 

Also incredibly interested about this -- just came across a ton of ads for them, so many diff vendors claiming same thing. Also super skeptical -- so you're going to give me 50+HP and save me massive MPG at same time?? Doesn't make sense.

What does make sense is if these engines are same used in Jag's with diff tuning to produce more HP.. but again, the MPG savings claims are odd.. as well as the method in OBDII port that these work.

 

I doubt if it would do any good by simply 'plugging it in' unless it adjusts the computer settings which is a scary thought. Sounds like Snake Oil to me.