Significant might not be the best word, there will be an increase, about 10hp from the dyno graphs floating around.... will you notice it ? Well that depends on you, how you drive, how sensitive you are to that kinda of a change..... since it's less than a 10% alot of people might not notice during daily driving at all..... but it also increases torque across the whole rpm range which most people will notice at least a little.... if you plan on driving kind of aggressive sometimes then yes you will probably notice a change, though probably not what most would call significant.