I own a 2.4 NA engine 170hp. I was thinking about ugrading the ECU and air filter with S.A.M. ECU upgrade and K&N sports air filter. S.A.M. says that this upgrade should add 15 hp and I would feel an increase in torque and better engine response.<P>I dont know much about this. Do you think that the difference would be noticeable? is it worth the money?