There is a noticeable difference at start up. If the stock system is a 3 on a 1-10 scale at start up the Solo will be a 6. When the car idles down there will be much a deeper sound.
When you take the car out you will notice a nice deep note as you accelerate normally and when you reach cruise you will hardly notice the exhaust. Punch it and you will think, holy cow.
On my car, a 6.1, at idle there is a slight bit of a raspy sound heard if you are standing by the rear of the car. I understand this is common / typical of Hemi engines with after market exhaust. You will not hear that in the car, or at least I do not.
If you are looking for the sound open headers would make then you will be disappointed. However, if you are wanting a nice deep note at idle, noticeable rumble upon acceleration, a cannon shot if you punch it, and virtually no sound at cruise then you will be very satisfied