I have the Gibson for the v8.
it sounds amazing. gives it that v8 sound thats lacking. not very loud from outside of the car or inside of the car, but you do hear it sound s lil more throaty from inside the cabin. it definitely doesnt have that huge sound on the interior that most cars do. if anything, it brings it up to about the same exterior noise that's commonly found on stock v8 Tahoe's and whatnot.
a good buy, i almost wish it was a little louder, but it's just enough to know it's there and still carry a normal conversation inside the car.