You have to realize that the close to 30hp difference between the two is close to 20% more horsepower. There will be a very noticeable difference. It is not like it is a 375 vs 400hp car. Small changes in hp are noticed more when you have lower numbers. Depending on the cams, you will notice a difference in the way the engine runs. Look up videos on youtube of vr6s with cams. They sound way different than stock.