do they really add 4 horse and improve throttle response?

 

lol all rev box companies claim they add hp...what they mean by saying that is 4 more hp on the powercurve since they add like 1000+ rpms to your engine, but as far as i know they dont actually add more hp, now dynatek programmable cdi's that have been programmed on a dyno by a specialist is a different story in some cases