before: removed the muffler on my 1994 350 engine GMC Sierra z71 and left the cat on. It was loud and sounded like a truck, but at the same time it sounded like my muffler needed replacing. After: I bought this Cherry Bomb to tune and tame the loud exhaust. WORKS BEAUTIFULLY! Couldn't be happier. The Axis still has a nice deep rumble, but it sounds classy and clean, yet sneaky, which complements the look. Will definitely be buying more for other trucks.