I used to design electronic circuits - (DC to DC power converters).

Open your booster up and take a high resolution picture.

I will tell you exactly what's in it and price it out. There are what?, two or three wires on the connector it goes between? that rules out any externally powered IC's (requiring a external voltage reference) thus limiting the types of amplifiers available for use.

The company that makes this device makes one for every drive-by-wire car known to man. So it is not a "MB" thing.

If it makes you feel good do it. That's their marketing genius - they sell the sizzle - not the steak.

I wanted to add one more thing - this device now becomes a single-point-of-failure. if it goes "poof" - your crossfire goes no-where.

One more thing - if you wire two sprint boosters in series - will you get twice the "boost"?