E-Ram
Here is the catch. Unless the charging system is operating at 100% efficiency then you are consuming more power than it takes to run the motor. If the alternator has only a minor loss of 10-15% that would translate into 70-100+ watts extra it would have consume to generate this amount. Now since we know that alternators don't make electricity for free, they use HP, then how much extra HP is the alternator going to consume?
Try this..
Start and run your car for a few minutes.
Stop the motor and disconnect the serpentine belt.
Make a 1/8 mile pass.
How much HP did you feel you gain? It feels like you gained about 50HP and you probably did. The ALT, PS, waterpump, AC, friction and so forth losses aren't there. The accessories eat HP. (Hence underdrive pulley systems) So if that device claims 10 HP will be gained I am betting that 8 at least 8 are used to make the alternator keep the battery charged. Not to mention the ignition system is now not getting as much voltage and spark intensity loss may result. Plus the heat generated by the process.
I might be just a tad sceptical.
v









