My son was looking on ebay at $10 performance module that says it will improve the gas mileage by 15 mpg and give the car ('92 300CE) another 45 horsepower. This module is supposed to send a "new message" to the ECU and has a guarantee not to affect or ruin any other aspects of the engine. I don't know what to tell him but it sounds like a scam to me.

Any thoughts? Can this be real?

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Norm K.
'97 E420 Sport
'06 E350 Sedan
'67 Mustang Coupe
'70 F-250
'15 VW Jetta