Anybody heard of these guys: MAGNUM Dyno Boost

I am ALWAYS sespicious of these types of product claims, but is sure looks interesting.

15% HP gain
Improved throttle response
Etc.

 

You should stay suspicious.

IF it does anything at all it will just dump more fuel into each cylinder. Without more spark/air/compression to go with that fuel you'll run way rich while making 0% more power.

 

I would also stay away from this type of "tune". It may make a little more power, add some responsiveness at the expense of your trouble-free factory reliable motor. Too rich or too lean - both are bad for longevity of your motor, cats, etc. In the end the factory ecu may adjust things anyway, giving up any real gains. Just my opinion from past experience of modifying vehicles.

 

Usually these things only modify/increase the rate of throttle response giving you the feeling of more power