Since it is a pretty new car the stock sound-deadening material should be in relatively good shape.
Are you looking to decrease road noise from the
undercarriage i.e. wheel/tire noise? or noise that is coming into the car from other drivers/automobiles on the road?
I have always had good experiences with Dynamat, which by itself is not ridiculously expensive, however the cost to have it installed can be significant. If this is something that you are going to do yourself you could probably pull it off on a budget. However it has been some time since I attemtped to sound deaden a car so the prices might have changed.