I have it on my personal Trackhawk and use it for daily driving. I also have a 1 year old that comes in the truck with me every day. The only time I get any cabin noise is going up a hill in 8th gear on the highway, and it is very little. This would be similar with any exhaust, including stock. The J pipes on the kit are adjustable, so once break-in is completed you can adjust them if you still have any drone. Break-in is about 700-1000 miles. Over that time, carbon begins to build up inside the pipes, making a more full note while lessening interior noise. Mine seemed to hit the sweet spot at around 750 miles. I am located in Long Island, NY. I will take anyone for a ride in it if you are local. We consider this kit to be moderately aggressive, but not invasive. It has plenty of volume on the outside, but is surprisingly quite calm on the inside.
Everyone's version of what "loud" is can be subjective, so we always suggest riding in a Solo equipped vehicle if you are undecided. The tone is deep, American muscle...with a full and rich note. It is not hollow or tinny sounding. Feel free to PM me with any questions or concerns.
Steve